diff --git a/src/main/java/com/company/agentfoundation/integration/wecom/WecomCallbackController.java b/src/main/java/com/company/agentfoundation/integration/wecom/WecomCallbackController.java
index bbe12e6..1d16403 100644
--- a/src/main/java/com/company/agentfoundation/integration/wecom/WecomCallbackController.java
+++ b/src/main/java/com/company/agentfoundation/integration/wecom/WecomCallbackController.java
@@ -13,15 +13,21 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.time.Instant;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
 @RestController
 @RequestMapping("/v1/integrations/wecom")
 public class WecomCallbackController {
   private static final Logger log = LoggerFactory.getLogger(WecomCallbackController.class);
+  private static final long MESSAGE_DEDUP_TTL_SECONDS = 600;
   private final FoundationProperties properties;
   private final WecomClient wecomClient;
   private final WecomCryptoService wecomCryptoService;
   private final AgentOrchestratorService agentOrchestratorService;
   private final XmlMapper xmlMapper = new XmlMapper();
+  private final Map<String, Long> processedMessages = new ConcurrentHashMap<>();
 
   public WecomCallbackController(
       FoundationProperties properties,
@@ -79,6 +85,11 @@ public class WecomCallbackController {
       return "success";
     }
 
+    if (isDuplicateMessage(msg)) {
+      log.info("wecom callback duplicate message ignored fromUser={} msgId={}", msg.getFromUserName(), msg.getMsgId());
+      return "success";
+    }
+
     log.info("wecom callback invoking agent orchestrator agentId={} fromUser={}", properties.getWecom().getCrmAgentId(), msg.getFromUserName());
     String reply = agentOrchestratorService.handleMessage(properties.getWecom().getCrmAgentId(), msg.getFromUserName(), userText);
     reply = (reply == null || reply.isBlank())
@@ -113,6 +124,30 @@ public class WecomCallbackController {
     return xmlMapper.readValue(body, WecomIncomingMessage.class);
   }
 
+  private boolean isDuplicateMessage(WecomIncomingMessage msg) {
+    evictExpiredMessages();
+    String key = messageDedupKey(msg);
+    Long previous = processedMessages.putIfAbsent(key, Instant.now().getEpochSecond());
+    return previous != null;
+  }
+
+  private String messageDedupKey(WecomIncomingMessage msg) {
+    if (msg.getMsgId() != null && !msg.getMsgId().isBlank()) {
+      return msg.getMsgId();
+    }
+    return "%s:%s:%s:%s".formatted(
+        msg.getFromUserName(),
+        msg.getToUserName(),
+        msg.getCreateTime(),
+        msg.getContent()
+    );
+  }
+
+  private void evictExpiredMessages() {
+    long expireBefore = Instant.now().minusSeconds(MESSAGE_DEDUP_TTL_SECONDS).getEpochSecond();
+    processedMessages.entrySet().removeIf(entry -> entry.getValue() < expireBefore);
+  }
+
   private String preview(String text) {
     if (text == null || text.isBlank()) {
       return "";
diff --git a/src/main/java/com/company/agentfoundation/integration/wecom/WecomIncomingMessage.java b/src/main/java/com/company/agentfoundation/integration/wecom/WecomIncomingMessage.java
index baa4fbf..ae8d665 100644
--- a/src/main/java/com/company/agentfoundation/integration/wecom/WecomIncomingMessage.java
+++ b/src/main/java/com/company/agentfoundation/integration/wecom/WecomIncomingMessage.java
@@ -15,6 +15,10 @@ public class WecomIncomingMessage {
   private String msgType;
   @JacksonXmlProperty(localName = "Content")
   private String content;
+  @JacksonXmlProperty(localName = "CreateTime")
+  private Long createTime;
+  @JacksonXmlProperty(localName = "MsgId")
+  private String msgId;
 
   public String getToUserName() { return toUserName; }
   public void setToUserName(String toUserName) { this.toUserName = toUserName; }
@@ -24,4 +28,8 @@ public class WecomIncomingMessage {
   public void setMsgType(String msgType) { this.msgType = msgType; }
   public String getContent() { return content; }
   public void setContent(String content) { this.content = content; }
+  public Long getCreateTime() { return createTime; }
+  public void setCreateTime(Long createTime) { this.createTime = createTime; }
+  public String getMsgId() { return msgId; }
+  public void setMsgId(String msgId) { this.msgId = msgId; }
 }