diff --git a/src/main/java/com/example/struts2/ValidationLabAction.java b/src/main/java/com/example/struts2/ValidationLabAction.java
new file mode 100644
index 0000000..92db68a
--- /dev/null
+++ b/src/main/java/com/example/struts2/ValidationLabAction.java
@@ -0,0 +1,46 @@
+package com.example.struts2;
+
+import com.opensymphony.xwork2.ActionSupport;
+
+public class ValidationLabAction extends ActionSupport {
+    private String username;
+    private String email;
+    private Integer age;
+    private String resultMessage;
+
+    @Override
+    public String execute() {
+        return SUCCESS;
+    }
+
+    public String submit() {
+        resultMessage = String.format("提交成功：username=%s, email=%s, age=%s", username, email, age);
+        return SUCCESS;
+    }
+
+    @Override
+    public void validate() {
+        if ("submit".equals(getActionName())) {
+            if (username == null || username.trim().length() < 2) {
+                addFieldError("username", "用户名至少 2 个字符");
+            }
+            if (email == null || !email.contains("@")) {
+                addFieldError("email", "邮箱格式不正确");
+            }
+            if (age == null || age < 1 || age > 120) {
+                addFieldError("age", "年龄必须在 1 到 120 之间");
+            }
+        }
+    }
+
+    private String actionName;
+    public String getActionName() { return actionName; }
+    public void setActionName(String actionName) { this.actionName = actionName; }
+    public String getUsername() { return username; }
+    public void setUsername(String username) { this.username = username; }
+    public String getEmail() { return email; }
+    public void setEmail(String email) { this.email = email; }
+    public Integer getAge() { return age; }
+    public void setAge(Integer age) { this.age = age; }
+    public String getResultMessage() { return resultMessage; }
+}
diff --git a/src/main/resources/struts.xml b/src/main/resources/struts.xml
index 101265e..d5ae109 100644
--- a/src/main/resources/struts.xml
+++ b/src/main/resources/struts.xml
@@ -72,6 +72,16 @@
         <action name="ognl_bind" class="com.example.struts2.OgnlLabAction" method="bind">
             <result>/ognl-lab.jsp</result>
         </action>
+
+        <action name="validation" class="com.example.struts2.ValidationLabAction">
+            <result>/validation-lab.jsp</result>
+        </action>
+
+        <action name="validation_submit" class="com.example.struts2.ValidationLabAction" method="submit">
+            <param name="actionName">submit</param>
+            <result>/validation-lab.jsp</result>
+            <result name="input">/validation-lab.jsp</result>
+        </action>
         
         <action name="interceptor_api" class="com.example.struts2.InterceptorDemoAction">
             <interceptor-ref name="apiStack"/>
diff --git a/src/main/webapp/index.jsp b/src/main/webapp/index.jsp
index a3978af..f89c0dd 100644
--- a/src/main/webapp/index.jsp
+++ b/src/main/webapp/index.jsp
@@ -66,6 +66,11 @@
             <p>可视化体验普通字段、嵌套对象、多选列表是如何被 Struts2 自动绑定到 Action 的。</p>
             <a href="ognl" class="btn purple">进入实验室</a>
         </div>
+        <div class="card">
+            <h3>⚠️ 验证与错误流实验</h3>
+            <p>通过错误示例/正确示例切换，直观看到字段错误、input 返回和成功路径的区别。</p>
+            <a href="validation" class="btn">进入实验室</a>
+        </div>
     </div>
 
     <div class="timeline">
diff --git a/src/main/webapp/learn.jsp b/src/main/webapp/learn.jsp
index 878a788..5d299ba 100644
--- a/src/main/webapp/learn.jsp
+++ b/src/main/webapp/learn.jsp
@@ -67,6 +67,11 @@
             <p>通过真正可交互的表单观察 Struts2 的字段绑定、嵌套对象绑定和集合绑定。</p>
             <a class="btn btn-purple" href="ognl">打开 OGNL 实验室</a>
         </div>
+        <div class="card">
+            <h3>⚠️ 验证与错误流实验</h3>
+            <p>学习为什么校验失败不会直接 500，而是回到 input 页面并显示字段级错误。</p>
+            <a class="btn" href="validation">打开验证实验室</a>
+        </div>
     </div>
 
     <h2>📚 学习路径</h2>
diff --git a/src/main/webapp/validation-lab.jsp b/src/main/webapp/validation-lab.jsp
new file mode 100644
index 0000000..086af1d
--- /dev/null
+++ b/src/main/webapp/validation-lab.jsp
@@ -0,0 +1,86 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<%@ taglib prefix="s" uri="/struts-tags" %>
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+    <title>验证与错误流实验室 - Struts2</title>
+    <style>
+        body { font-family: Arial, sans-serif; max-width: 900px; margin: 40px auto; padding: 20px; background:#f7f8fa; }
+        h1 { color:#c0392b; }
+        .card { background:#fff; border-radius:12px; padding:20px; margin:18px 0; box-shadow:0 4px 14px rgba(0,0,0,.06); }
+        .lab { background:#fff7e6; border-left:4px solid #fa8c16; padding:15px; border-radius:8px; margin:20px 0; }
+        .quick { display:flex; gap:10px; flex-wrap:wrap; margin-bottom:12px; }
+        button { background:#c0392b; color:white; border:none; padding:10px 16px; border-radius:6px; cursor:pointer; }
+        input { padding:10px; width:100%; box-sizing:border-box; }
+        .field { margin:12px 0; }
+        .ok { background:#eafaf1; color:#1e8449; padding:12px; border-radius:8px; }
+    </style>
+</head>
+<body>
+    <h1>⚠️ 验证与错误流实验室</h1>
+
+    <div class="lab">
+        <strong>实验任务卡</strong>
+        <ul>
+            <li>先点“填入错误示例”，提交后观察字段级错误是如何显示的</li>
+            <li>再点“填入正确示例”，观察 Action 成功后的返回</li>
+            <li>思考：为什么 Struts2 的校验失败会回到 input 页，而不是直接报 500？</li>
+        </ul>
+    </div>
+
+    <div class="card">
+        <div class="quick">
+            <button type="button" onclick="fillBad()">填入错误示例</button>
+            <button type="button" onclick="fillGood()">填入正确示例</button>
+        </div>
+
+        <s:if test="resultMessage != null">
+            <div class="ok"><s:property value="resultMessage"/></div>
+        </s:if>
+
+        <s:form action="validation_submit" method="post">
+            <div class="field">
+                <label>用户名</label>
+                <s:textfield name="username"/>
+                <s:fielderror fieldName="username" cssStyle="color:#e74c3c;font-size:12px;"/>
+            </div>
+            <div class="field">
+                <label>邮箱</label>
+                <s:textfield name="email"/>
+                <s:fielderror fieldName="email" cssStyle="color:#e74c3c;font-size:12px;"/>
+            </div>
+            <div class="field">
+                <label>年龄</label>
+                <s:textfield name="age"/>
+                <s:fielderror fieldName="age" cssStyle="color:#e74c3c;font-size:12px;"/>
+            </div>
+            <button type="submit">提交实验</button>
+        </s:form>
+    </div>
+
+    <div class="card">
+        <h3>学习点</h3>
+        <ul>
+            <li>字段错误通过 <code>addFieldError()</code> 收集</li>
+            <li>JSP 使用 <code>&lt;s:fielderror&gt;</code> 精准展示错误</li>
+            <li>成功路径与失败路径在同一个页面闭环，对学习最直观</li>
+        </ul>
+    </div>
+
+    <p><a href="learn">← 返回学习中心</a></p>
+
+    <script>
+        function fillBad() {
+            document.querySelector('input[name="username"]').value = 'a';
+            document.querySelector('input[name="email"]').value = 'bad-email';
+            document.querySelector('input[name="age"]').value = '-1';
+        }
+        function fillGood() {
+            document.querySelector('input[name="username"]').value = 'zhangsan';
+            document.querySelector('input[name="email"]').value = 'zhangsan@example.com';
+            document.querySelector('input[name="age"]').value = '22';
+        }
+    </script>
+</body>
+</html>