diff --git a/src/components/proxy/AutoFailoverConfigPanel.tsx b/src/components/proxy/AutoFailoverConfigPanel.tsx
index 30f55e13..b80130fc 100644
--- a/src/components/proxy/AutoFailoverConfigPanel.tsx
+++ b/src/components/proxy/AutoFailoverConfigPanel.tsx
@@ -21,52 +21,64 @@ export function AutoFailoverConfigPanel({
   const { data: config, isLoading, error } = useAppProxyConfig(appType);
   const updateConfig = useUpdateAppProxyConfig();
 
+  // 使用字符串状态以支持完全清空数字输入框
   const [formData, setFormData] = useState({
     autoFailoverEnabled: false,
-    maxRetries: 3,
-    streamingFirstByteTimeout: 30,
-    streamingIdleTimeout: 60,
-    nonStreamingTimeout: 300,
-    circuitFailureThreshold: 5,
-    circuitSuccessThreshold: 2,
-    circuitTimeoutSeconds: 60,
-    circuitErrorRateThreshold: 0.5,
-    circuitMinRequests: 10,
+    maxRetries: "3",
+    streamingFirstByteTimeout: "30",
+    streamingIdleTimeout: "60",
+    nonStreamingTimeout: "300",
+    circuitFailureThreshold: "5",
+    circuitSuccessThreshold: "2",
+    circuitTimeoutSeconds: "60",
+    circuitErrorRateThreshold: "50", // 存储百分比值
+    circuitMinRequests: "10",
   });
 
   useEffect(() => {
     if (config) {
       setFormData({
         autoFailoverEnabled: config.autoFailoverEnabled,
-        maxRetries: config.maxRetries,
-        streamingFirstByteTimeout: config.streamingFirstByteTimeout,
-        streamingIdleTimeout: config.streamingIdleTimeout,
-        nonStreamingTimeout: config.nonStreamingTimeout,
-        circuitFailureThreshold: config.circuitFailureThreshold,
-        circuitSuccessThreshold: config.circuitSuccessThreshold,
-        circuitTimeoutSeconds: config.circuitTimeoutSeconds,
-        circuitErrorRateThreshold: config.circuitErrorRateThreshold,
-        circuitMinRequests: config.circuitMinRequests,
+        maxRetries: String(config.maxRetries),
+        streamingFirstByteTimeout: String(config.streamingFirstByteTimeout),
+        streamingIdleTimeout: String(config.streamingIdleTimeout),
+        nonStreamingTimeout: String(config.nonStreamingTimeout),
+        circuitFailureThreshold: String(config.circuitFailureThreshold),
+        circuitSuccessThreshold: String(config.circuitSuccessThreshold),
+        circuitTimeoutSeconds: String(config.circuitTimeoutSeconds),
+        circuitErrorRateThreshold: String(
+          Math.round(config.circuitErrorRateThreshold * 100),
+        ),
+        circuitMinRequests: String(config.circuitMinRequests),
       });
     }
   }, [config]);
 
   const handleSave = async () => {
     if (!config) return;
+    // 解析数字，空值使用默认值，0 是有效值
+    const parseNum = (val: string, defaultVal: number) => {
+      const n = parseInt(val);
+      return isNaN(n) ? defaultVal : n;
+    };
     try {
       await updateConfig.mutateAsync({
         appType,
         enabled: config.enabled,
         autoFailoverEnabled: formData.autoFailoverEnabled,
-        maxRetries: formData.maxRetries,
-        streamingFirstByteTimeout: formData.streamingFirstByteTimeout,
-        streamingIdleTimeout: formData.streamingIdleTimeout,
-        nonStreamingTimeout: formData.nonStreamingTimeout,
-        circuitFailureThreshold: formData.circuitFailureThreshold,
-        circuitSuccessThreshold: formData.circuitSuccessThreshold,
-        circuitTimeoutSeconds: formData.circuitTimeoutSeconds,
-        circuitErrorRateThreshold: formData.circuitErrorRateThreshold,
-        circuitMinRequests: formData.circuitMinRequests,
+        maxRetries: parseNum(formData.maxRetries, 3),
+        streamingFirstByteTimeout: parseNum(
+          formData.streamingFirstByteTimeout,
+          30,
+        ),
+        streamingIdleTimeout: parseNum(formData.streamingIdleTimeout, 60),
+        nonStreamingTimeout: parseNum(formData.nonStreamingTimeout, 300),
+        circuitFailureThreshold: parseNum(formData.circuitFailureThreshold, 5),
+        circuitSuccessThreshold: parseNum(formData.circuitSuccessThreshold, 2),
+        circuitTimeoutSeconds: parseNum(formData.circuitTimeoutSeconds, 60),
+        circuitErrorRateThreshold:
+          parseNum(formData.circuitErrorRateThreshold, 50) / 100,
+        circuitMinRequests: parseNum(formData.circuitMinRequests, 10),
       });
       toast.success(
         t("proxy.autoFailover.configSaved", "自动故障转移配置已保存"),
@@ -83,15 +95,17 @@ export function AutoFailoverConfigPanel({
     if (config) {
       setFormData({
         autoFailoverEnabled: config.autoFailoverEnabled,
-        maxRetries: config.maxRetries,
-        streamingFirstByteTimeout: config.streamingFirstByteTimeout,
-        streamingIdleTimeout: config.streamingIdleTimeout,
-        nonStreamingTimeout: config.nonStreamingTimeout,
-        circuitFailureThreshold: config.circuitFailureThreshold,
-        circuitSuccessThreshold: config.circuitSuccessThreshold,
-        circuitTimeoutSeconds: config.circuitTimeoutSeconds,
-        circuitErrorRateThreshold: config.circuitErrorRateThreshold,
-        circuitMinRequests: config.circuitMinRequests,
+        maxRetries: String(config.maxRetries),
+        streamingFirstByteTimeout: String(config.streamingFirstByteTimeout),
+        streamingIdleTimeout: String(config.streamingIdleTimeout),
+        nonStreamingTimeout: String(config.nonStreamingTimeout),
+        circuitFailureThreshold: String(config.circuitFailureThreshold),
+        circuitSuccessThreshold: String(config.circuitSuccessThreshold),
+        circuitTimeoutSeconds: String(config.circuitTimeoutSeconds),
+        circuitErrorRateThreshold: String(
+          Math.round(config.circuitErrorRateThreshold * 100),
+        ),
+        circuitMinRequests: String(config.circuitMinRequests),
       });
     }
   };
@@ -142,13 +156,9 @@ export function AutoFailoverConfigPanel({
                 min="0"
                 max="10"
                 value={formData.maxRetries}
-                onChange={(e) => {
-                  const val = parseInt(e.target.value);
-                  setFormData({
-                    ...formData,
-                    maxRetries: isNaN(val) ? 0 : val,
-                  });
-                }}
+                onChange={(e) =>
+                  setFormData({ ...formData, maxRetries: e.target.value })
+                }
                 disabled={isDisabled}
               />
               <p className="text-xs text-muted-foreground">
@@ -169,13 +179,12 @@ export function AutoFailoverConfigPanel({
                 min="1"
                 max="20"
                 value={formData.circuitFailureThreshold}
-                onChange={(e) => {
-                  const val = parseInt(e.target.value);
+                onChange={(e) =>
                   setFormData({
                     ...formData,
-                    circuitFailureThreshold: isNaN(val) ? 1 : Math.max(1, val),
-                  });
-                }}
+                    circuitFailureThreshold: e.target.value,
+                  })
+                }
                 disabled={isDisabled}
               />
               <p className="text-xs text-muted-foreground">
@@ -208,13 +217,12 @@ export function AutoFailoverConfigPanel({
                 min="0"
                 max="180"
                 value={formData.streamingFirstByteTimeout}
-                onChange={(e) => {
-                  const val = parseInt(e.target.value);
+                onChange={(e) =>
                   setFormData({
                     ...formData,
-                    streamingFirstByteTimeout: isNaN(val) ? 0 : val,
-                  });
-                }}
+                    streamingFirstByteTimeout: e.target.value,
+                  })
+                }
                 disabled={isDisabled}
               />
               <p className="text-xs text-muted-foreground">
@@ -235,13 +243,12 @@ export function AutoFailoverConfigPanel({
                 min="0"
                 max="600"
                 value={formData.streamingIdleTimeout}
-                onChange={(e) => {
-                  const val = parseInt(e.target.value);
+                onChange={(e) =>
                   setFormData({
                     ...formData,
-                    streamingIdleTimeout: isNaN(val) ? 0 : val,
-                  });
-                }}
+                    streamingIdleTimeout: e.target.value,
+                  })
+                }
                 disabled={isDisabled}
               />
               <p className="text-xs text-muted-foreground">
@@ -262,13 +269,12 @@ export function AutoFailoverConfigPanel({
                 min="0"
                 max="1800"
                 value={formData.nonStreamingTimeout}
-                onChange={(e) => {
-                  const val = parseInt(e.target.value);
+                onChange={(e) =>
                   setFormData({
                     ...formData,
-                    nonStreamingTimeout: isNaN(val) ? 0 : val,
-                  });
-                }}
+                    nonStreamingTimeout: e.target.value,
+                  })
+                }
                 disabled={isDisabled}
               />
               <p className="text-xs text-muted-foreground">
@@ -298,13 +304,12 @@ export function AutoFailoverConfigPanel({
                 min="1"
                 max="10"
                 value={formData.circuitSuccessThreshold}
-                onChange={(e) => {
-                  const val = parseInt(e.target.value);
+                onChange={(e) =>
                   setFormData({
                     ...formData,
-                    circuitSuccessThreshold: isNaN(val) ? 1 : Math.max(1, val),
-                  });
-                }}
+                    circuitSuccessThreshold: e.target.value,
+                  })
+                }
                 disabled={isDisabled}
               />
               <p className="text-xs text-muted-foreground">
@@ -325,13 +330,12 @@ export function AutoFailoverConfigPanel({
                 min="10"
                 max="300"
                 value={formData.circuitTimeoutSeconds}
-                onChange={(e) => {
-                  const val = parseInt(e.target.value);
+                onChange={(e) =>
                   setFormData({
                     ...formData,
-                    circuitTimeoutSeconds: isNaN(val) ? 10 : Math.max(10, val),
-                  });
-                }}
+                    circuitTimeoutSeconds: e.target.value,
+                  })
+                }
                 disabled={isDisabled}
               />
               <p className="text-xs text-muted-foreground">
@@ -352,14 +356,13 @@ export function AutoFailoverConfigPanel({
                 min="0"
                 max="100"
                 step="5"
-                value={Math.round(formData.circuitErrorRateThreshold * 100)}
-                onChange={(e) => {
-                  const val = parseInt(e.target.value);
+                value={formData.circuitErrorRateThreshold}
+                onChange={(e) =>
                   setFormData({
                     ...formData,
-                    circuitErrorRateThreshold: isNaN(val) ? 0.5 : val / 100,
-                  });
-                }}
+                    circuitErrorRateThreshold: e.target.value,
+                  })
+                }
                 disabled={isDisabled}
               />
               <p className="text-xs text-muted-foreground">
@@ -380,13 +383,12 @@ export function AutoFailoverConfigPanel({
                 min="5"
                 max="100"
                 value={formData.circuitMinRequests}
-                onChange={(e) => {
-                  const val = parseInt(e.target.value);
+                onChange={(e) =>
                   setFormData({
                     ...formData,
-                    circuitMinRequests: isNaN(val) ? 5 : Math.max(5, val),
-                  });
-                }}
+                    circuitMinRequests: e.target.value,
+                  })
+                }
                 disabled={isDisabled}
               />
               <p className="text-xs text-muted-foreground">
diff --git a/src/components/proxy/CircuitBreakerConfigPanel.tsx b/src/components/proxy/CircuitBreakerConfigPanel.tsx
index 93f48d59..5341df33 100644
--- a/src/components/proxy/CircuitBreakerConfigPanel.tsx
+++ b/src/components/proxy/CircuitBreakerConfigPanel.tsx
@@ -16,24 +16,43 @@ export function CircuitBreakerConfigPanel() {
   const { data: config, isLoading } = useCircuitBreakerConfig();
   const updateConfig = useUpdateCircuitBreakerConfig();
 
+  // 使用字符串状态以支持完全清空输入框
   const [formData, setFormData] = useState({
-    failureThreshold: 5,
-    successThreshold: 2,
-    timeoutSeconds: 60,
-    errorRateThreshold: 0.5,
-    minRequests: 10,
+    failureThreshold: "5",
+    successThreshold: "2",
+    timeoutSeconds: "60",
+    errorRateThreshold: "50", // 存储百分比值
+    minRequests: "10",
   });
 
   // 当配置加载完成时更新表单数据
   useEffect(() => {
     if (config) {
-      setFormData(config);
+      setFormData({
+        failureThreshold: String(config.failureThreshold),
+        successThreshold: String(config.successThreshold),
+        timeoutSeconds: String(config.timeoutSeconds),
+        errorRateThreshold: String(Math.round(config.errorRateThreshold * 100)),
+        minRequests: String(config.minRequests),
+      });
     }
   }, [config]);
 
   const handleSave = async () => {
+    // 解析数字，空值使用默认值，0 是有效值
+    const parseNum = (val: string, defaultVal: number) => {
+      const n = parseInt(val);
+      return isNaN(n) ? defaultVal : n;
+    };
     try {
-      await updateConfig.mutateAsync(formData);
+      const parsed = {
+        failureThreshold: parseNum(formData.failureThreshold, 5),
+        successThreshold: parseNum(formData.successThreshold, 2),
+        timeoutSeconds: parseNum(formData.timeoutSeconds, 60),
+        errorRateThreshold: parseNum(formData.errorRateThreshold, 50) / 100,
+        minRequests: parseNum(formData.minRequests, 10),
+      };
+      await updateConfig.mutateAsync(parsed);
       toast.success("熔断器配置已保存", { closeButton: true });
     } catch (error) {
       toast.error("保存失败: " + String(error));
@@ -42,7 +61,13 @@ export function CircuitBreakerConfigPanel() {
 
   const handleReset = () => {
     if (config) {
-      setFormData(config);
+      setFormData({
+        failureThreshold: String(config.failureThreshold),
+        successThreshold: String(config.successThreshold),
+        timeoutSeconds: String(config.timeoutSeconds),
+        errorRateThreshold: String(Math.round(config.errorRateThreshold * 100)),
+        minRequests: String(config.minRequests),
+      });
     }
   };
 
@@ -72,10 +97,7 @@ export function CircuitBreakerConfigPanel() {
             max="20"
             value={formData.failureThreshold}
             onChange={(e) =>
-              setFormData({
-                ...formData,
-                failureThreshold: parseInt(e.target.value) || 5,
-              })
+              setFormData({ ...formData, failureThreshold: e.target.value })
             }
           />
           <p className="text-xs text-muted-foreground">
@@ -93,10 +115,7 @@ export function CircuitBreakerConfigPanel() {
             max="300"
             value={formData.timeoutSeconds}
             onChange={(e) =>
-              setFormData({
-                ...formData,
-                timeoutSeconds: parseInt(e.target.value) || 60,
-              })
+              setFormData({ ...formData, timeoutSeconds: e.target.value })
             }
           />
           <p className="text-xs text-muted-foreground">
@@ -114,10 +133,7 @@ export function CircuitBreakerConfigPanel() {
             max="10"
             value={formData.successThreshold}
             onChange={(e) =>
-              setFormData({
-                ...formData,
-                successThreshold: parseInt(e.target.value) || 2,
-              })
+              setFormData({ ...formData, successThreshold: e.target.value })
             }
           />
           <p className="text-xs text-muted-foreground">
@@ -134,12 +150,9 @@ export function CircuitBreakerConfigPanel() {
             min="0"
             max="100"
             step="5"
-            value={Math.round(formData.errorRateThreshold * 100)}
+            value={formData.errorRateThreshold}
             onChange={(e) =>
-              setFormData({
-                ...formData,
-                errorRateThreshold: (parseInt(e.target.value) || 50) / 100,
-              })
+              setFormData({ ...formData, errorRateThreshold: e.target.value })
             }
           />
           <p className="text-xs text-muted-foreground">
@@ -157,10 +170,7 @@ export function CircuitBreakerConfigPanel() {
             max="100"
             value={formData.minRequests}
             onChange={(e) =>
-              setFormData({
-                ...formData,
-                minRequests: parseInt(e.target.value) || 10,
-              })
+              setFormData({ ...formData, minRequests: e.target.value })
             }
           />
           <p className="text-xs text-muted-foreground">
diff --git a/src/components/proxy/ProxyPanel.tsx b/src/components/proxy/ProxyPanel.tsx
index be540832..1cf88a14 100644
--- a/src/components/proxy/ProxyPanel.tsx
+++ b/src/components/proxy/ProxyPanel.tsx
@@ -38,15 +38,15 @@ export function ProxyPanel() {
   const { data: globalConfig } = useGlobalProxyConfig();
   const updateGlobalConfig = useUpdateGlobalProxyConfig();
 
-  // 监听地址/端口的本地状态
+  // 监听地址/端口的本地状态（端口用字符串以支持完全清空）
   const [listenAddress, setListenAddress] = useState("127.0.0.1");
-  const [listenPort, setListenPort] = useState(15721);
+  const [listenPort, setListenPort] = useState("15721");
 
   // 同步全局配置到本地状态
   useEffect(() => {
     if (globalConfig) {
       setListenAddress(globalConfig.listenAddress);
-      setListenPort(globalConfig.listenPort);
+      setListenPort(String(globalConfig.listenPort));
     }
   }, [globalConfig]);
 
@@ -102,11 +102,13 @@ export function ProxyPanel() {
 
   const handleSaveBasicConfig = async () => {
     if (!globalConfig) return;
+    const port = parseInt(listenPort);
+    const validPort = isNaN(port) || port < 1024 || port > 65535 ? 15721 : port;
     try {
       await updateGlobalConfig.mutateAsync({
         ...globalConfig,
         listenAddress,
-        listenPort,
+        listenPort: validPort,
       });
       toast.success(
         t("proxy.settings.configSaved", { defaultValue: "代理配置已保存" }),
@@ -414,9 +416,7 @@ export function ProxyPanel() {
                     id="listen-port"
                     type="number"
                     value={listenPort}
-                    onChange={(e) =>
-                      setListenPort(parseInt(e.target.value) || 15721)
-                    }
+                    onChange={(e) => setListenPort(e.target.value)}
                     placeholder={t(
                       "proxy.settings.fields.listenPort.placeholder",
                       {
diff --git a/src/components/usage/ModelTestConfigPanel.tsx b/src/components/usage/ModelTestConfigPanel.tsx
index 213cf615..95a7e889 100644
--- a/src/components/usage/ModelTestConfigPanel.tsx
+++ b/src/components/usage/ModelTestConfigPanel.tsx
@@ -17,10 +17,11 @@ export function ModelTestConfigPanel() {
   const [isLoading, setIsLoading] = useState(true);
   const [isSaving, setIsSaving] = useState(false);
   const [error, setError] = useState<string | null>(null);
-  const [config, setConfig] = useState<StreamCheckConfig>({
-    timeoutSecs: 45,
-    maxRetries: 2,
-    degradedThresholdMs: 6000,
+  // 使用字符串状态以支持完全清空数字输入框
+  const [config, setConfig] = useState({
+    timeoutSecs: "45",
+    maxRetries: "2",
+    degradedThresholdMs: "6000",
     claudeModel: "claude-haiku-4-5-20251001",
     codexModel: "gpt-5.1-codex@low",
     geminiModel: "gemini-3-pro-preview",
@@ -35,7 +36,14 @@ export function ModelTestConfigPanel() {
       setIsLoading(true);
       setError(null);
       const data = await getStreamCheckConfig();
-      setConfig(data);
+      setConfig({
+        timeoutSecs: String(data.timeoutSecs),
+        maxRetries: String(data.maxRetries),
+        degradedThresholdMs: String(data.degradedThresholdMs),
+        claudeModel: data.claudeModel,
+        codexModel: data.codexModel,
+        geminiModel: data.geminiModel,
+      });
     } catch (e) {
       setError(String(e));
     } finally {
@@ -44,9 +52,22 @@ export function ModelTestConfigPanel() {
   }
 
   async function handleSave() {
+    // 解析数字，空值使用默认值，0 是有效值
+    const parseNum = (val: string, defaultVal: number) => {
+      const n = parseInt(val);
+      return isNaN(n) ? defaultVal : n;
+    };
     try {
       setIsSaving(true);
-      await saveStreamCheckConfig(config);
+      const parsed: StreamCheckConfig = {
+        timeoutSecs: parseNum(config.timeoutSecs, 45),
+        maxRetries: parseNum(config.maxRetries, 2),
+        degradedThresholdMs: parseNum(config.degradedThresholdMs, 6000),
+        claudeModel: config.claudeModel,
+        codexModel: config.codexModel,
+        geminiModel: config.geminiModel,
+      };
+      await saveStreamCheckConfig(parsed);
       toast.success(t("streamCheck.configSaved"), {
         closeButton: true,
       });
@@ -132,10 +153,7 @@ export function ModelTestConfigPanel() {
               max={120}
               value={config.timeoutSecs}
               onChange={(e) =>
-                setConfig({
-                  ...config,
-                  timeoutSecs: parseInt(e.target.value) || 45,
-                })
+                setConfig({ ...config, timeoutSecs: e.target.value })
               }
             />
           </div>
@@ -149,10 +167,7 @@ export function ModelTestConfigPanel() {
               max={5}
               value={config.maxRetries}
               onChange={(e) =>
-                setConfig({
-                  ...config,
-                  maxRetries: parseInt(e.target.value) || 2,
-                })
+                setConfig({ ...config, maxRetries: e.target.value })
               }
             />
           </div>
@@ -169,10 +184,7 @@ export function ModelTestConfigPanel() {
               step={1000}
               value={config.degradedThresholdMs}
               onChange={(e) =>
-                setConfig({
-                  ...config,
-                  degradedThresholdMs: parseInt(e.target.value) || 6000,
-                })
+                setConfig({ ...config, degradedThresholdMs: e.target.value })
               }
             />
           </div>