diff --git a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/parser/NacosDataParserHandler.java b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/parser/NacosDataParserHandler.java
index e127f4e8..9d3c94ab 100644
--- a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/parser/NacosDataParserHandler.java
+++ b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/parser/NacosDataParserHandler.java
@@ -26,6 +26,7 @@ import java.util.Objects;
 import java.util.stream.Collectors;
 
 import com.alibaba.cloud.nacos.utils.NacosConfigUtils;
+
 import org.springframework.boot.env.OriginTrackedMapPropertySource;
 import org.springframework.boot.env.PropertiesPropertySourceLoader;
 import org.springframework.boot.env.PropertySourceLoader;
diff --git a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/parser/NacosXmlPropertySourceLoader.java b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/parser/NacosXmlPropertySourceLoader.java
index 4c37e44a..f656bed3 100644
--- a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/parser/NacosXmlPropertySourceLoader.java
+++ b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/parser/NacosXmlPropertySourceLoader.java
@@ -79,7 +79,7 @@ public class NacosXmlPropertySourceLoader extends AbstractPropertySourceLoader
 	 * return a list containing a single source, or in the case of a multi-document format
 	 * such as yaml a source for each document in the resource.
 	 * @param name the root name of the property source. If multiple documents are loaded
-	 *     an additional suffix should be added to the name for each source loaded.
+	 * an additional suffix should be added to the name for each source loaded.
 	 * @param resource the resource to load
 	 * @return a list property sources
 	 * @throws IOException if the source cannot be loaded
diff --git a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/utils/NacosConfigUtils.java b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/utils/NacosConfigUtils.java
index dbad593a..386d160e 100644
--- a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/utils/NacosConfigUtils.java
+++ b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/main/java/com/alibaba/cloud/nacos/utils/NacosConfigUtils.java
@@ -21,10 +21,13 @@ package com.alibaba.cloud.nacos.utils;
  */
 public final class NacosConfigUtils {
 
+	private NacosConfigUtils(){
+	}
+
 	/**
 	 * Convert Chinese characters to Unicode.
-	 * @param configValue
-	 * @return
+	 * @param configValue value of config
+	 * @return new string
 	 */
 	public static String selectiveConvertUnicode(String configValue) {
 		StringBuilder sb = new StringBuilder();
@@ -42,8 +45,8 @@ public final class NacosConfigUtils {
 
 	/**
 	 * char is chinese?
-	 * @param c
-	 * @return
+	 * @param c a character
+	 * @return true or false
 	 */
 	public static boolean isChinese(char c) {
 		Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);