diff --git a/nacos-spring-context/src/main/java/com/alibaba/nacos/spring/util/NacosUtils.java b/nacos-spring-context/src/main/java/com/alibaba/nacos/spring/util/NacosUtils.java
index 1fceef05..770a15d7 100644
--- a/nacos-spring-context/src/main/java/com/alibaba/nacos/spring/util/NacosUtils.java
+++ b/nacos-spring-context/src/main/java/com/alibaba/nacos/spring/util/NacosUtils.java
@@ -366,6 +366,11 @@ protected static void merge(Properties targetProperties,
 			if (!targetProperties.containsKey(propertyName)) {
 				String propertyValue = (String) entry.getValue();
 				targetProperties.setProperty(propertyName, propertyValue);
+			} else {
+				// when the key values of the same target and source are different, the value of source is taken
+				if (!targetProperties.get(propertyName).equals(sourceProperties.get(propertyName))) {
+					targetProperties.setProperty(propertyName, (String) sourceProperties.get(propertyName));
+				}
 			}
 		}
 
diff --git a/nacos-spring-context/src/test/java/com/alibaba/nacos/spring/util/NacosUtilsTest.java b/nacos-spring-context/src/test/java/com/alibaba/nacos/spring/util/NacosUtilsTest.java
index 6efc2726..4e8e3652 100644
--- a/nacos-spring-context/src/test/java/com/alibaba/nacos/spring/util/NacosUtilsTest.java
+++ b/nacos-spring-context/src/test/java/com/alibaba/nacos/spring/util/NacosUtilsTest.java
@@ -17,8 +17,10 @@
 package com.alibaba.nacos.spring.util;
 
 import java.lang.reflect.Field;
+import java.util.Properties;
 
 import org.junit.Assert;
+import org.junit.Before;
 import org.junit.Test;
 import org.springframework.util.ReflectionUtils;
 
@@ -38,6 +40,31 @@ public class NacosUtilsTest {
 
 	@NacosInjected(properties = @NacosProperties(serverAddr = "test"))
 	private Object object2 = new Object();
+	
+	
+	Properties globalProperties;
+	
+	Properties currentProperties = new Properties();
+	
+	@Before
+	public void setUp(){
+		globalProperties = new Properties();
+		globalProperties.setProperty("namespace","nacos_ns_playground");
+		globalProperties.setProperty("username","nacos");
+		globalProperties.setProperty("enableRemoteSyncConfig","true");
+		globalProperties.setProperty("configLongPollTimeout","30000");
+		globalProperties.setProperty("configRetryTime","2000");
+		globalProperties.setProperty("encode","UTF-8");
+		globalProperties.setProperty("serverAddr","http://test01-nacos.api.net:8080");
+		globalProperties.setProperty("maxRetry","3");
+		globalProperties.setProperty("password","nacos");
+		
+		currentProperties = new Properties();
+		currentProperties.setProperty("password","nacos_test");
+		currentProperties.setProperty("namespace","nacos_ns_playground");
+		currentProperties.setProperty("encode","UTF-8");
+		currentProperties.setProperty("serverAddr","http://test02-nacos.api.net:8848");
+	}
 
 	@Test
 	public void testIsDefault() {
@@ -53,8 +80,16 @@ private void testIsDefault(String fieldName, boolean expectedValue) {
 		NacosInjected nacosInjected = objectField.getAnnotation(NacosInjected.class);
 
 		NacosProperties nacosProperties = nacosInjected.properties();
-
 		Assert.assertEquals(expectedValue, NacosUtils.isDefault(nacosProperties));
-
+	}
+	
+	/**
+	 * NacosUtils merge test.
+	 */
+	@Test
+	public void merge() {
+		NacosUtils.merge(globalProperties, currentProperties);
+		Assert.assertEquals(globalProperties.getProperty("serverAddr"), "http://test02-nacos.api.net:8848");
+		Assert.assertEquals(globalProperties.size(), 9);
 	}
 }