diff --git a/src-tauri/src/services/skill.rs b/src-tauri/src/services/skill.rs
index e7bd84f06..641560770 100644
--- a/src-tauri/src/services/skill.rs
+++ b/src-tauri/src/services/skill.rs
@@ -252,6 +252,50 @@ impl SkillService {
             .map(|s| s.to_string_lossy().to_string())
             .unwrap_or_else(|| skill.directory.clone());
 
+        // 检查数据库中是否已有同名 directory 的 skill（来自其他仓库）
+        let existing_skills = db.get_all_installed_skills()?;
+        for existing in existing_skills.values() {
+            if existing.directory.eq_ignore_ascii_case(&install_name) {
+                // 检查是否来自同一仓库
+                let same_repo = existing.repo_owner.as_deref() == Some(&skill.repo_owner)
+                    && existing.repo_name.as_deref() == Some(&skill.repo_name);
+                if same_repo {
+                    // 同一仓库的同名 skill，返回现有记录（可能需要更新启用状态）
+                    let mut updated = existing.clone();
+                    updated.apps.set_enabled_for(current_app, true);
+                    db.save_skill(&updated)?;
+                    Self::sync_to_app_dir(&updated.directory, current_app)?;
+                    log::info!(
+                        "Skill {} 已存在，更新 {:?} 启用状态",
+                        updated.name,
+                        current_app
+                    );
+                    return Ok(updated);
+                } else {
+                    // 不同仓库的同名 skill，报错
+                    return Err(anyhow!(format_skill_error(
+                        "SKILL_DIRECTORY_CONFLICT",
+                        &[
+                            ("directory", &install_name),
+                            (
+                                "existing_repo",
+                                &format!(
+                                    "{}/{}",
+                                    existing.repo_owner.as_deref().unwrap_or("unknown"),
+                                    existing.repo_name.as_deref().unwrap_or("unknown")
+                                )
+                            ),
+                            (
+                                "new_repo",
+                                &format!("{}/{}", skill.repo_owner, skill.repo_name)
+                            ),
+                        ],
+                        Some("uninstallFirst"),
+                    )));
+                }
+            }
+        }
+
         let dest = ssot_dir.join(&install_name);
 
         // 如果已存在则跳过下载
@@ -933,10 +977,12 @@ impl SkillService {
         Ok(meta)
     }
 
-    /// 去重技能列表
+    /// 去重技能列表（基于完整 key，不同仓库的同名 skill 分开显示）
     fn deduplicate_discoverable_skills(skills: &mut Vec<DiscoverableSkill>) {
         let mut seen = HashMap::new();
         skills.retain(|skill| {
+            // 使用完整 key（owner/repo:directory）作为唯一标识
+            // 这样不同仓库的同名 skill 会分开显示
             let unique_key = skill.key.to_lowercase();
             if let std::collections::hash_map::Entry::Vacant(e) = seen.entry(unique_key) {
                 e.insert(true);
diff --git a/src/components/skills/SkillsPage.tsx b/src/components/skills/SkillsPage.tsx
index 7ab030e0b..73865513f 100644
--- a/src/components/skills/SkillsPage.tsx
+++ b/src/components/skills/SkillsPage.tsx
@@ -65,10 +65,17 @@ export const SkillsPage = forwardRef<SkillsPageHandle, SkillsPageProps>(
     const addRepoMutation = useAddSkillRepo();
     const removeRepoMutation = useRemoveSkillRepo();
 
-    // 已安装的 directory 集合
-    const installedDirs = useMemo(() => {
+    // 已安装的 skill key 集合（使用 directory + repoOwner + repoName 组合判断）
+    const installedKeys = useMemo(() => {
       if (!installedSkills) return new Set<string>();
-      return new Set(installedSkills.map((s) => s.directory.toLowerCase()));
+      return new Set(
+        installedSkills.map((s) => {
+          // 构建唯一 key：directory + repoOwner + repoName
+          const owner = s.repoOwner?.toLowerCase() || "";
+          const name = s.repoName?.toLowerCase() || "";
+          return `${s.directory.toLowerCase()}:${owner}:${name}`;
+        }),
+      );
     }, [installedSkills]);
 
     type DiscoverableSkillItem = DiscoverableSkill & { installed: boolean };
@@ -80,12 +87,14 @@ export const SkillsPage = forwardRef<SkillsPageHandle, SkillsPageProps>(
         const installName =
           d.directory.split("/").pop()?.toLowerCase() ||
           d.directory.toLowerCase();
+        // 使用 directory + repoOwner + repoName 组合判断是否已安装
+        const key = `${installName}:${d.repoOwner.toLowerCase()}:${d.repoName.toLowerCase()}`;
         return {
           ...d,
-          installed: installedDirs.has(installName),
+          installed: installedKeys.has(key),
         };
       });
-    }, [discoverableSkills, installedDirs]);
+    }, [discoverableSkills, installedKeys]);
 
     const loading = loadingDiscoverable || fetchingDiscoverable;
 
diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index 9f08e7eda..00c9af3e7 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -972,6 +972,7 @@
       "downloadTimeoutHint": "Please check network connection or retry later",
       "skillPathNotFound": "Skill path '{{path}}' not found in repository {{owner}}/{{name}}",
       "skillDirNotFound": "Skill directory not found: {{path}}",
+      "directoryConflict": "Skill directory '{{directory}}' is already occupied by {{existing_repo}}, cannot install from {{new_repo}}",
       "emptyArchive": "Downloaded archive is empty",
       "downloadFailed": "Download failed: HTTP {{status}}",
       "allBranchesFailed": "All branches failed, tried: {{branches}}",
@@ -990,7 +991,8 @@
         "retryLater": "Please retry later",
         "checkRepoUrl": "Please check repository URL and branch name",
         "checkDiskSpace": "Please check disk space",
-        "checkPermission": "Please check directory permissions"
+        "checkPermission": "Please check directory permissions",
+        "uninstallFirst": "Please uninstall the existing skill with the same name first"
       }
     },
     "repo": {
diff --git a/src/i18n/locales/ja.json b/src/i18n/locales/ja.json
index 029fbc6bc..a9254f47b 100644
--- a/src/i18n/locales/ja.json
+++ b/src/i18n/locales/ja.json
@@ -972,6 +972,7 @@
       "downloadTimeoutHint": "ネットワークを確認するか、時間をおいて再試行してください",
       "skillPathNotFound": "リポジトリ {{owner}}/{{name}} にスキルパス '{{path}}' がありません",
       "skillDirNotFound": "スキルディレクトリが見つかりません: {{path}}",
+      "directoryConflict": "スキルディレクトリ '{{directory}}' は既に {{existing_repo}} で使用されています。{{new_repo}} からインストールできません",
       "emptyArchive": "ダウンロードしたアーカイブが空です",
       "downloadFailed": "ダウンロードに失敗しました: HTTP {{status}}",
       "allBranchesFailed": "すべてのブランチで失敗しました。試行: {{branches}}",
@@ -990,7 +991,8 @@
         "retryLater": "時間をおいて再試行してください",
         "checkRepoUrl": "リポジトリ URL とブランチ名を確認してください",
         "checkDiskSpace": "ディスク容量を確認してください",
-        "checkPermission": "ディレクトリの権限を確認してください"
+        "checkPermission": "ディレクトリの権限を確認してください",
+        "uninstallFirst": "同名のスキルを先にアンインストールしてください"
       }
     },
     "repo": {
diff --git a/src/i18n/locales/zh.json b/src/i18n/locales/zh.json
index b83d8fc0b..e86c7aae6 100644
--- a/src/i18n/locales/zh.json
+++ b/src/i18n/locales/zh.json
@@ -972,6 +972,7 @@
       "downloadTimeoutHint": "请检查网络连接或稍后重试",
       "skillPathNotFound": "仓库 {{owner}}/{{name}} 中未找到技能路径 '{{path}}'",
       "skillDirNotFound": "技能目录不存在：{{path}}",
+      "directoryConflict": "技能目录 '{{directory}}' 已被 {{existing_repo}} 占用，无法从 {{new_repo}} 安装",
       "emptyArchive": "下载的压缩包为空",
       "downloadFailed": "下载失败：HTTP {{status}}",
       "allBranchesFailed": "所有分支下载失败，尝试了：{{branches}}",
@@ -990,7 +991,8 @@
         "retryLater": "请稍后重试",
         "checkRepoUrl": "请检查仓库地址和分支名称",
         "checkDiskSpace": "请检查磁盘空间",
-        "checkPermission": "请检查目录权限"
+        "checkPermission": "请检查目录权限",
+        "uninstallFirst": "请先卸载已安装的同名技能"
       }
     },
     "repo": {
diff --git a/src/lib/errors/skillErrorParser.ts b/src/lib/errors/skillErrorParser.ts
index 6b0f93ed3..db6f6d905 100644
--- a/src/lib/errors/skillErrorParser.ts
+++ b/src/lib/errors/skillErrorParser.ts
@@ -35,6 +35,7 @@ function getErrorI18nKey(code: string): string {
     DOWNLOAD_TIMEOUT: "skills.error.downloadTimeout",
     DOWNLOAD_FAILED: "skills.error.downloadFailed",
     SKILL_DIR_NOT_FOUND: "skills.error.skillDirNotFound",
+    SKILL_DIRECTORY_CONFLICT: "skills.error.directoryConflict",
     EMPTY_ARCHIVE: "skills.error.emptyArchive",
     GET_HOME_DIR_FAILED: "skills.error.getHomeDirFailed",
   };
@@ -52,6 +53,7 @@ function getSuggestionI18nKey(suggestion: string): string {
     retryLater: "skills.error.suggestion.retryLater",
     checkRepoUrl: "skills.error.suggestion.checkRepoUrl",
     checkPermission: "skills.error.suggestion.checkPermission",
+    uninstallFirst: "skills.error.suggestion.uninstallFirst",
     http403: "skills.error.http403",
     http404: "skills.error.http404",
     http429: "skills.error.http429",