diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0f181d38..53c7d3354 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,3 +36,4 @@
 - [docs: Fix javadoc <br /> error](https://github.com/Tencent/spring-cloud-tencent/pull/371)
 - [UT: add Polaris LoadBalancer unit test](https://github.com/Tencent/spring-cloud-tencent/pull/373)
 - [docs:update docs](https://github.com/Tencent/spring-cloud-tencent/pull/378)
+- [docs:optimize example](https://github.com/Tencent/spring-cloud-tencent/pull/385)
diff --git a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceA.java b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceA.java
index 1c96db6c9..3db7df8f3 100644
--- a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceA.java
+++ b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceA.java
@@ -35,7 +35,7 @@ import org.springframework.web.client.RestTemplate;
 public class ServiceA {
 
 	public static void main(String[] args) {
-		SpringApplication.run(ServiceA.class);
+		SpringApplication.run(ServiceA.class, args);
 	}
 
 	@Bean
@@ -43,5 +43,4 @@ public class ServiceA {
 	public RestTemplate restTemplate() {
 		return new RestTemplate();
 	}
-
 }
diff --git a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceAController.java b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceAController.java
index 29768d584..79ba2c0ef 100644
--- a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceAController.java
+++ b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-a/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceAController.java
@@ -64,5 +64,4 @@ public class ServiceAController {
 				String.class);
 		return entity.getBody();
 	}
-
 }
diff --git a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceB.java b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceB.java
index 7354da537..c8c32bf24 100644
--- a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceB.java
+++ b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceB.java
@@ -29,7 +29,6 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 public class ServiceB {
 
 	public static void main(String[] args) {
-		SpringApplication.run(ServiceB.class);
+		SpringApplication.run(ServiceB.class, args);
 	}
-
 }
diff --git a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceBController.java b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceBController.java
index 67540c2c9..99b8410d8 100644
--- a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceBController.java
+++ b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/java/com/tencent/cloud/polaris/circuitbreaker/example/ServiceBController.java
@@ -18,7 +18,6 @@
 
 package com.tencent.cloud.polaris.circuitbreaker.example;
 
-import org.springframework.beans.factory.annotation.Value;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
@@ -32,21 +31,12 @@ import org.springframework.web.bind.annotation.RestController;
 @RequestMapping("/example/service/b")
 public class ServiceBController {
 
-	@Value("${is-throw-runtime-exception:#{false}}")
-	private boolean isThrowRuntimeException;
-
 	/**
 	 * Get service information.
 	 * @return service information
 	 */
 	@GetMapping("/info")
 	public String info() {
-		if (isThrowRuntimeException) {
-			throw new RuntimeException("failed for call my service");
-		}
-		else {
-			return "hello world ! I'm a service B1";
-		}
+		return "hello world ! I'm a service B1";
 	}
-
 }
diff --git a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/resources/bootstrap.yml b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/resources/bootstrap.yml
index 4aba50500..3805dfa5e 100644
--- a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/resources/bootstrap.yml
+++ b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b/src/main/resources/bootstrap.yml
@@ -8,4 +8,3 @@ spring:
       address: grpc://183.47.111.80:8091
       namespace: default
       enabled: true
-is-throw-runtime-exception: false
diff --git a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/java/com/tencent/cloud/polaris/ciruitbreaker/example/ServiceB2.java b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/java/com/tencent/cloud/polaris/ciruitbreaker/example/ServiceB2.java
index 4aacc0d22..fb6bdc687 100644
--- a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/java/com/tencent/cloud/polaris/ciruitbreaker/example/ServiceB2.java
+++ b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/java/com/tencent/cloud/polaris/ciruitbreaker/example/ServiceB2.java
@@ -30,7 +30,6 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 public class ServiceB2 {
 
 	public static void main(String[] args) {
-		SpringApplication.run(ServiceB2.class);
+		SpringApplication.run(ServiceB2.class, args);
 	}
-
 }
diff --git a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/java/com/tencent/cloud/polaris/ciruitbreaker/example/ServiceBController.java b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/java/com/tencent/cloud/polaris/ciruitbreaker/example/ServiceBController.java
index 7e4bb9b4c..83dc45303 100644
--- a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/java/com/tencent/cloud/polaris/ciruitbreaker/example/ServiceBController.java
+++ b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/java/com/tencent/cloud/polaris/ciruitbreaker/example/ServiceBController.java
@@ -18,9 +18,10 @@
 
 package com.tencent.cloud.polaris.ciruitbreaker.example;
 
-import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
 import org.springframework.web.bind.annotation.RestController;
 
 /**
@@ -32,21 +33,13 @@ import org.springframework.web.bind.annotation.RestController;
 @RequestMapping("/example/service/b")
 public class ServiceBController {
 
-	@Value("${is-throw-runtime-exception:#{false}}")
-	private boolean isThrowRuntimeException;
-
 	/**
 	 * Get service information.
 	 * @return service information
 	 */
 	@GetMapping("/info")
+	@ResponseStatus(value = HttpStatus.BAD_GATEWAY, reason = "failed for call my service")
 	public String info() {
-		if (isThrowRuntimeException) {
-			throw new RuntimeException("failed for call my service");
-		}
-		else {
-			return "hello world ! I'm a service B2";
-		}
+		return "failed for call service B2";
 	}
-
 }
diff --git a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/resources/bootstrap.yml b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/resources/bootstrap.yml
index b150a5424..f3720f09c 100644
--- a/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/resources/bootstrap.yml
+++ b/spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-example-b2/src/main/resources/bootstrap.yml
@@ -8,4 +8,3 @@ spring:
       address: grpc://183.47.111.80:8091
       namespace: default
       enabled: true
-is-throw-runtime-exception: true
diff --git a/spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml b/spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml
index 84e44d4aa..1f257a787 100644
--- a/spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml
+++ b/spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml
@@ -17,4 +17,4 @@ management:
     web:
       exposure:
         include:
-          - polaris-config
\ No newline at end of file
+          - polaris-config