diff --git a/api/src/main/java/com/alibaba/nacos/api/naming/pojo/Instance.java b/api/src/main/java/com/alibaba/nacos/api/naming/pojo/Instance.java
index b1e0e2e9d25..fc4c7baa542 100644
--- a/api/src/main/java/com/alibaba/nacos/api/naming/pojo/Instance.java
+++ b/api/src/main/java/com/alibaba/nacos/api/naming/pojo/Instance.java
@@ -19,6 +19,7 @@
 import com.alibaba.nacos.api.common.Constants;
 import com.alibaba.nacos.api.naming.PreservedMetadataKeys;
 import com.alibaba.nacos.api.naming.utils.NamingUtils;
+import com.alibaba.nacos.api.utils.StringUtils;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonInclude.Include;
 
@@ -26,6 +27,7 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
+import java.util.concurrent.atomic.AtomicLong;
 
 /**
  * Instance.
@@ -35,6 +37,11 @@
 @JsonInclude(Include.NON_NULL)
 public class Instance implements Serializable {
     
+    /**
+     * Instance auto-increment index, used to generate instance ID
+     */
+    private static final AtomicLong index = new AtomicLong();
+    
     private static final long serialVersionUID = -742906310567291979L;
     
     /**
@@ -264,4 +271,14 @@ private String getMetaDataByKeyWithDefault(final String key, final String defaul
         return getMetadata().get(key);
     }
     
+    /**
+     * Generate and set the instance id when the instance id is empty
+     */
+    public void setInstanceIdIfNeeded() {
+        if (StringUtils.isEmpty(this.instanceId)) {
+            long curIndex = index.getAndIncrement();
+            this.instanceId = ip + Constants.COLON + port + Constants.NAMING_INSTANCE_ID_SPLITTER + curIndex
+                    + Constants.NAMING_INSTANCE_ID_SPLITTER + System.currentTimeMillis();
+        }
+    }
 }
diff --git a/api/src/main/java/com/alibaba/nacos/api/naming/utils/NamingUtils.java b/api/src/main/java/com/alibaba/nacos/api/naming/utils/NamingUtils.java
index 7c88abc70ad..02934e3ec10 100644
--- a/api/src/main/java/com/alibaba/nacos/api/naming/utils/NamingUtils.java
+++ b/api/src/main/java/com/alibaba/nacos/api/naming/utils/NamingUtils.java
@@ -184,4 +184,24 @@ public static void batchCheckInstanceIsLegal(List<Instance> instances) throws Na
     public static boolean isNumber(String str) {
         return !StringUtils.isEmpty(str) && NUMBER_PATTERN.matcher(str).matches();
     }
+    
+    /**
+     * Set instanceId if needed
+     *
+     * @param instance Instance to be registered
+     */
+    public static void setInstanceIdIfNeeded(Instance instance) {
+        instance.setInstanceIdIfNeeded();
+    }
+    
+    /**
+     * Batch set instanceId if needed
+     *
+     * @param instances List of instances to be registered
+     */
+    public static void batchSetInstanceIdIfNeeded(List<Instance> instances) {
+        for (Instance instance : instances) {
+            instance.setInstanceIdIfNeeded();
+        }
+    }
 }
diff --git a/api/src/test/java/com/alibaba/nacos/api/naming/utils/NamingUtilsTest.java b/api/src/test/java/com/alibaba/nacos/api/naming/utils/NamingUtilsTest.java
index 159616f28aa..67b86814869 100644
--- a/api/src/test/java/com/alibaba/nacos/api/naming/utils/NamingUtilsTest.java
+++ b/api/src/test/java/com/alibaba/nacos/api/naming/utils/NamingUtilsTest.java
@@ -30,6 +30,8 @@
 import java.util.Map;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 
 public class NamingUtilsTest {
@@ -240,4 +242,56 @@ public void testIsNumber() {
         String str2 = "123456";
         assertTrue(NamingUtils.isNumber(str2));
     }
+    
+    @Test
+    public void testSetInstanceIdIfNeeded() {
+        Instance instance = new Instance();
+        NamingUtils.setInstanceIdIfNeeded(instance);
+        assertNotNull(instance.getInstanceId());
+        String customInsId = "customId_1";
+        instance.setInstanceId(customInsId);
+        assertEquals(customInsId, instance.getInstanceId());
+        
+        Instance instance1 = new Instance();
+        Instance instance2 = new Instance();
+        Instance instance3 = new Instance();
+        
+        NamingUtils.setInstanceIdIfNeeded(instance1);
+        NamingUtils.setInstanceIdIfNeeded(instance2);
+        NamingUtils.setInstanceIdIfNeeded(instance3);
+        
+        assertNotNull(instance1.getInstanceId());
+        assertNotNull(instance2.getInstanceId());
+        assertNotNull(instance3.getInstanceId());
+        
+        assertNotEquals(instance1.getInstanceId(), instance2.getInstanceId());
+        assertNotEquals(instance1.getInstanceId(), instance3.getInstanceId());
+        assertNotEquals(instance2.getInstanceId(), instance3.getInstanceId());
+    }
+    
+    @Test
+    public void testBatchSetInstanceIdIfNeeded() {
+        List<Instance> instances = new ArrayList<>();
+        Instance instance1 = new Instance();
+        String customInsId = "customId_1";
+        instance1.setInstanceId(customInsId);
+        Instance instance2 = new Instance();
+        Instance instance3 = new Instance();
+        
+        instances.add(instance1);
+        instances.add(instance2);
+        instances.add(instance3);
+        
+        NamingUtils.batchSetInstanceIdIfNeeded(instances);
+        
+        assertNotNull(instance1.getInstanceId());
+        assertNotNull(instance2.getInstanceId());
+        assertNotNull(instance3.getInstanceId());
+        
+        assertEquals(customInsId, instance1.getInstanceId());
+        
+        assertNotEquals(instance1.getInstanceId(), instance2.getInstanceId());
+        assertNotEquals(instance1.getInstanceId(), instance3.getInstanceId());
+        assertNotEquals(instance2.getInstanceId(), instance3.getInstanceId());
+    }
 }
diff --git a/client/src/main/java/com/alibaba/nacos/client/naming/NacosNamingService.java b/client/src/main/java/com/alibaba/nacos/client/naming/NacosNamingService.java
index a03e35559e3..7b95d18b403 100644
--- a/client/src/main/java/com/alibaba/nacos/client/naming/NacosNamingService.java
+++ b/client/src/main/java/com/alibaba/nacos/client/naming/NacosNamingService.java
@@ -140,6 +140,7 @@ public void registerInstance(String serviceName, Instance instance) throws Nacos
     @Override
     public void registerInstance(String serviceName, String groupName, Instance instance) throws NacosException {
         NamingUtils.checkInstanceIsLegal(instance);
+        NamingUtils.setInstanceIdIfNeeded(instance);
         clientProxy.registerService(serviceName, groupName, instance);
     }
     
@@ -147,6 +148,7 @@ public void registerInstance(String serviceName, String groupName, Instance inst
     public void batchRegisterInstance(String serviceName, String groupName, List<Instance> instances)
             throws NacosException {
         NamingUtils.batchCheckInstanceIsLegal(instances);
+        NamingUtils.batchSetInstanceIdIfNeeded(instances);
         clientProxy.batchRegisterService(serviceName, groupName, instances);
     }