diff --git a/agent.properties b/agent.properties
index 6a51543..4993dcc 100644
--- a/agent.properties
+++ b/agent.properties
@@ -1,7 +1,7 @@
 # mock文件路径
 foxMockFilePath=/Users/yinjihuan/Documents/foxmockdata
 # foxmock的agent jar包路径，不填默认为当前文件夹
-foxMockAgentJarPath=fox-mock-agent/target/fox-mock-agent-3.0.jar
+foxMockAgentJarPath=fox-mock-agent/target/fox-mock-agent-4.0.jar
 # mock方法白名单,如果文件夹中有多个方法会被全部mock,如果指定了此配置将只会mock这里指定的方法
 #mockMethodWhiteList=com.cxytiandi.foxmock.example.UserService#getAge|com.cxytiandi.foxmock.example.UserService#getName2
 # httpn mock数据地址，可以对接配置中心，必须是get请求
diff --git a/fox-mock-agent/pom.xml b/fox-mock-agent/pom.xml
index d35616d..84aeae8 100644
--- a/fox-mock-agent/pom.xml
+++ b/fox-mock-agent/pom.xml
@@ -7,7 +7,7 @@
         <groupId>com.cxytiandi</groupId>
         <version>1.0-SNAPSHOT</version>
     </parent>
-    <version>3.0</version>
+    <version>4.0</version>
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>fox-mock-agent</artifactId>
diff --git a/fox-mock-agent/src/main/java/com/cxytiandi/foxmock/agent/transformer/MockClassFileTransformer.java b/fox-mock-agent/src/main/java/com/cxytiandi/foxmock/agent/transformer/MockClassFileTransformer.java
index a2a91e9..71977ff 100644
--- a/fox-mock-agent/src/main/java/com/cxytiandi/foxmock/agent/transformer/MockClassFileTransformer.java
+++ b/fox-mock-agent/src/main/java/com/cxytiandi/foxmock/agent/transformer/MockClassFileTransformer.java
@@ -60,10 +60,16 @@ public byte[] transform(ClassLoader loader, String className, Class<?> classBein
                if (Objects.nonNull(data)) {
                    match = true;
                    LOG.info(String.format("mock methods %s, mock data is %s", key, data));
-                   String mockCode = "if(true){" +
-                                         "return ($r)com.cxytiandi.foxmock.agent.utils.JsonUtils.parse(%s,%s,%s);" +
-                                     "}";
-                   method.insertBefore(String.format(mockCode, new Gson().toJson(data), "\""+className+"\"", "\""+methodName+"\""));
+                   if (data.startsWith("throw new")) {
+                       String mockCode = "if(true){%s}";
+                       method.insertBefore(String.format(mockCode, data));
+                   } else {
+                       String mockCode = "if(true){" +
+                                             "return ($r)com.cxytiandi.foxmock.agent.utils.JsonUtils.parse(%s,%s,%s);" +
+                                         "}";
+                       method.insertBefore(String.format(mockCode, new Gson().toJson(data), "\""+className+"\"", "\""+methodName+"\""));
+                   }
+
                }
            }
 
diff --git a/fox-mock-boot/src/main/java/com/cxytiandi/foxmock/boot/Bootstrap.java b/fox-mock-boot/src/main/java/com/cxytiandi/foxmock/boot/Bootstrap.java
index 0d5a942..1ee4fcd 100644
--- a/fox-mock-boot/src/main/java/com/cxytiandi/foxmock/boot/Bootstrap.java
+++ b/fox-mock-boot/src/main/java/com/cxytiandi/foxmock/boot/Bootstrap.java
@@ -31,7 +31,7 @@ public static void main(String[] args) {
             String mockDataHttpUrl = config.getProperty("mockDataHttpUrl", "");
 
             if (Objects.isNull(foxMockAgentJarPath)) {
-                foxMockAgentJarPath = PathUtils.getAgentPath() + File.separator + "fox-mock-agent-3.0.jar";
+                foxMockAgentJarPath = PathUtils.getAgentPath() + File.separator + "fox-mock-agent-4.0.jar";
             }
 
             VirtualMachine attach = VirtualMachine.attach(String.valueOf(getPid()));
diff --git a/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/FoxMockApp.java b/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/FoxMockApp.java
index 8784578..1a255f3 100644
--- a/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/FoxMockApp.java
+++ b/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/FoxMockApp.java
@@ -36,7 +36,11 @@ public static void main(String[] args) throws Exception {
                     System.out.println(k + "\t" + v.getAddress());
                 });
             }
-
+            try {
+                userService.mockException();
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
             System.out.println("----------------------------------------");
             Thread.sleep(5000);
         }
diff --git a/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/MockException.java b/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/MockException.java
new file mode 100644
index 0000000..4736d96
--- /dev/null
+++ b/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/MockException.java
@@ -0,0 +1,16 @@
+package com.cxytiandi.foxmock.example;
+
+/**
+ * @作者 尹吉欢
+ * @个人微信 jihuan900
+ * @微信公众号 猿天地
+ * @GitHub https://github.com/yinjihuan
+ * @作者介绍 http://cxytiandi.com/about
+ * @时间 2022-05-09 21:59
+ */
+public class MockException extends RuntimeException {
+
+    public MockException(String msg) {
+        super(msg);
+    }
+}
diff --git a/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/UserService.java b/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/UserService.java
index d176490..2d6be96 100644
--- a/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/UserService.java
+++ b/fox-mock-example/src/main/java/com/cxytiandi/foxmock/example/UserService.java
@@ -44,4 +44,7 @@ public Result<UserDetail> getUserDetail() {
         return result;
     }
 
+    public void mockException() {
+
+    }
 }
diff --git a/fox-mock-example/src/main/resources/mockdata/com.cxytiandi.foxmock.example.UserService#mockException b/fox-mock-example/src/main/resources/mockdata/com.cxytiandi.foxmock.example.UserService#mockException
new file mode 100644
index 0000000..f78fd5f
--- /dev/null
+++ b/fox-mock-example/src/main/resources/mockdata/com.cxytiandi.foxmock.example.UserService#mockException
@@ -0,0 +1 @@
+throw new com.cxytiandi.foxmock.example.MockException("mock exception");
\ No newline at end of file