diff --git a/src/main/java/com/gameplatform/server/mapper/agent/LinkTaskMapper.java b/src/main/java/com/gameplatform/server/mapper/agent/LinkTaskMapper.java
index 1822b91..8655889 100644
--- a/src/main/java/com/gameplatform/server/mapper/agent/LinkTaskMapper.java
+++ b/src/main/java/com/gameplatform/server/mapper/agent/LinkTaskMapper.java
@@ -110,4 +110,9 @@ public interface LinkTaskMapper extends BaseMapper<LinkTask> {
      * 根据状态列表和代理ID批量删除链接任务
      */
     int batchDeleteByStatusListAndAgentId(@Param("statusList") List<String> statusList, @Param("agentId") Long agentId);
+    
+    /**
+     * 根据状态查询所有链接任务
+     */
+    List<LinkTask> findByStatus(@Param("status") String status);
 }
diff --git a/src/main/java/com/gameplatform/server/service/admin/AnnouncementByCodeService.java b/src/main/java/com/gameplatform/server/service/admin/AnnouncementByCodeService.java
new file mode 100644
index 0000000..1746a80
--- /dev/null
+++ b/src/main/java/com/gameplatform/server/service/admin/AnnouncementByCodeService.java
@@ -0,0 +1,122 @@
+package com.gameplatform.server.service.admin;
+
+import com.gameplatform.server.mapper.agent.LinkTaskMapper;
+import com.gameplatform.server.model.entity.admin.Announcement;
+import com.gameplatform.server.model.entity.agent.LinkTask;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class AnnouncementByCodeService {
+    
+    private static final Logger logger = LoggerFactory.getLogger(AnnouncementByCodeService.class);
+    
+    @Autowired
+    private LinkTaskMapper linkTaskMapper;
+    
+    @Autowired
+    private AnnouncementService announcementService;
+    
+    /**
+     * 根据codeNo获取对应代理商设置的公告
+     * 
+     * @param codeNo 链接编号
+     * @return 代理商设置的启用公告列表
+     * @throws IllegalArgumentException 当codeNo为空或对应的链接任务不存在时
+     */
+    public List<Announcement> getAnnouncementsByCodeNo(String codeNo) {
+        logger.info("开始根据codeNo查询代理商公告: {}", codeNo);
+        
+        if (codeNo == null || codeNo.trim().isEmpty()) {
+            logger.warn("codeNo为空或空字符串: {}", codeNo);
+            throw new IllegalArgumentException("codeNo不能为空");
+        }
+        
+        logger.debug("步骤1: 根据codeNo查询link_task表: {}", codeNo);
+        LinkTask linkTask = linkTaskMapper.findByCodeNo(codeNo);
+        if (linkTask == null) {
+            logger.warn("未找到对应的链接任务, codeNo: {}", codeNo);
+            throw new IllegalArgumentException("找不到对应的链接任务: " + codeNo);
+        }
+        
+        logger.debug("查询到链接任务: id={}, agentId={}, status={}", 
+                    linkTask.getId(), linkTask.getAgentId(), linkTask.getStatus());
+        
+        Long agentId = linkTask.getAgentId();
+        if (agentId == null) {
+            logger.warn("链接任务的代理商ID为空, codeNo: {}, taskId: {}", codeNo, linkTask.getId());
+            throw new IllegalArgumentException("链接任务的代理商ID为空: " + codeNo);
+        }
+        
+        logger.debug("步骤2: 根据agentId查询announcement表: agentId={}", agentId);
+        List<Announcement> announcements = announcementService.getEnabledAnnouncementsByBelongId(agentId.intValue());
+        
+        logger.info("查询完成, codeNo: {}, agentId: {}, 找到公告数量: {}", 
+                   codeNo, agentId, announcements.size());
+        
+        if (logger.isDebugEnabled()) {
+            announcements.forEach(announcement -> 
+                logger.debug("公告详情: id={}, title={}, belongId={}", 
+                           announcement.getId(), announcement.getTitle(), announcement.getBelongId()));
+        }
+        
+        return announcements;
+    }
+    
+    /**
+     * 检查codeNo是否有效（链接任务存在）
+     * 
+     * @param codeNo 链接编号
+     * @return true 如果codeNo对应的链接任务存在，否则false
+     */
+    public boolean isCodeNoValid(String codeNo) {
+        logger.debug("检查codeNo是否有效: {}", codeNo);
+        
+        if (codeNo == null || codeNo.trim().isEmpty()) {
+            logger.debug("codeNo为空，返回false: {}", codeNo);
+            return false;
+        }
+        
+        LinkTask linkTask = linkTaskMapper.findByCodeNo(codeNo);
+        boolean isValid = linkTask != null && linkTask.getAgentId() != null;
+        
+        logger.debug("codeNo有效性检查结果: {}, 有效: {}", codeNo, isValid);
+        if (linkTask != null) {
+            logger.debug("链接任务存在: id={}, agentId={}", linkTask.getId(), linkTask.getAgentId());
+        }
+        
+        return isValid;
+    }
+    
+    /**
+     * 根据codeNo获取对应的代理商ID
+     * 
+     * @param codeNo 链接编号
+     * @return 代理商ID，如果codeNo无效返回null
+     */
+    public Long getAgentIdByCodeNo(String codeNo) {
+        logger.debug("根据codeNo获取代理商ID: {}", codeNo);
+        
+        if (codeNo == null || codeNo.trim().isEmpty()) {
+            logger.debug("codeNo为空，返回null: {}", codeNo);
+            return null;
+        }
+        
+        LinkTask linkTask = linkTaskMapper.findByCodeNo(codeNo);
+        Long agentId = linkTask != null ? linkTask.getAgentId() : null;
+        
+        logger.debug("codeNo: {}, 对应的agentId: {}", codeNo, agentId);
+        if (linkTask != null) {
+            logger.debug("链接任务详情: id={}, status={}, agentId={}", 
+                        linkTask.getId(), linkTask.getStatus(), linkTask.getAgentId());
+        } else {
+            logger.debug("未找到对应的链接任务: {}", codeNo);
+        }
+        
+        return agentId;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/gameplatform/server/task/UsingLinkCheckTask.java b/src/main/java/com/gameplatform/server/task/UsingLinkCheckTask.java
new file mode 100644
index 0000000..0b8499e
--- /dev/null
+++ b/src/main/java/com/gameplatform/server/task/UsingLinkCheckTask.java
@@ -0,0 +1,104 @@
+package com.gameplatform.server.task;
+
+import com.gameplatform.server.mapper.agent.LinkTaskMapper;
+import com.gameplatform.server.model.entity.agent.LinkTask;
+import com.gameplatform.server.service.link.LinkStatusService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+
+/**
+ * USING状态链接检查定时任务
+ * 每30秒检测状态为USING的链接，调用checkAndHandleLoginStatus函数
+ */
+@Component
+@Slf4j
+public class UsingLinkCheckTask {
+
+    private final LinkTaskMapper linkTaskMapper;
+    private final LinkStatusService linkStatusService;
+
+    public UsingLinkCheckTask(LinkTaskMapper linkTaskMapper, LinkStatusService linkStatusService) {
+        this.linkTaskMapper = linkTaskMapper;
+        this.linkStatusService = linkStatusService;
+    }
+
+    /**
+     * 每30秒检测一次USING状态的链接
+     */
+    @Scheduled(fixedRate = 30000) // 每30秒执行一次
+    public void checkUsingLinksAndHandleLoginStatus() {
+        log.debug("开始定时检查USING状态的链接");
+        
+        try {
+            // 1. 查询所有USING状态的链接任务
+            List<LinkTask> usingTasks = linkTaskMapper.findByStatus("USING");
+            
+            if (usingTasks.isEmpty()) {
+                log.debug("当前没有USING状态的链接");
+                return;
+            }
+            
+            log.debug("发现 {} 个USING状态的链接", usingTasks.size());
+            
+            // 2. 对每个USING状态的链接调用checkAndHandleLoginStatus
+            for (LinkTask linkTask : usingTasks) {
+                try {
+                    log.debug("检查链接 {} (设备: {}) 的登录状态", linkTask.getCodeNo(), linkTask.getMachineId());
+                    
+                    // 调用checkAndHandleLoginStatus函数 - 这里需要使用私有方法的逻辑
+                    if (linkTask.getMachineId() != null) {
+                        checkAndHandleLoginStatus(linkTask);
+                    } else {
+                        log.warn("链接 {} 没有关联设备，跳过检查", linkTask.getCodeNo());
+                    }
+                    
+                } catch (Exception e) {
+                    log.error("检查链接 {} 登录状态时发生异常: {}", linkTask.getCodeNo(), e.getMessage());
+                    // 继续检查下一个链接，不因为一个链接出错而中断整个流程
+                }
+            }
+            
+        } catch (Exception e) {
+            log.error("定时检查USING状态链接时发生异常", e);
+        }
+        
+        log.debug("定时检查USING状态链接完成");
+    }
+
+    /**
+     * 检查并处理登录状态
+     * 复制LinkStatusService中checkAndHandleLoginStatus的逻辑
+     */
+    private void checkAndHandleLoginStatus(LinkTask linkTask) {
+        try {
+            String deviceId = linkTask.getMachineId();
+            if (deviceId == null) {
+                log.warn("无法获取设备编号: codeNo={}", linkTask.getCodeNo());
+                return;
+            }
+
+            log.debug("调用轮询上号接口检查链接 {} 的登录状态", linkTask.getCodeNo());
+            
+            // 调用LinkStatusService的pollLogin方法来处理登录状态检查
+            linkStatusService.pollLogin(linkTask.getCodeNo())
+                .subscribe(
+                    response -> {
+                        if (response.isSuccess()) {
+                            log.info("定时检查发现链接 {} 已成功登录，状态已更新", linkTask.getCodeNo());
+                        } else {
+                            log.debug("链接 {} 尚未登录，状态: {}", linkTask.getCodeNo(), response.getStatus());
+                        }
+                    },
+                    error -> {
+                        log.warn("检查链接 {} 登录状态失败: {}", linkTask.getCodeNo(), error.getMessage());
+                    }
+                );
+                
+        } catch (Exception e) {
+            log.error("处理链接 {} 登录状态检查时发生异常: {}", linkTask.getCodeNo(), e.getMessage());
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/resources/mapper/agent/LinkTaskMapper.xml b/src/main/resources/mapper/agent/LinkTaskMapper.xml
index 9cbe841..b589f51 100644
--- a/src/main/resources/mapper/agent/LinkTaskMapper.xml
+++ b/src/main/resources/mapper/agent/LinkTaskMapper.xml
@@ -248,4 +248,11 @@
             #{status}
         </foreach>
     </delete>
+
+    <select id="findByStatus" resultMap="LinkTaskMap">
+        SELECT id, batch_id, agent_id, code_no, token_hash, expire_at, status, region, machine_id, login_at, refund_at, revoked_at, created_at, updated_at, need_refresh, refresh_time, qr_created_at, qr_expire_at, first_region_select_at, completed_points, completion_images
+        FROM link_task
+        WHERE status = #{status}
+        ORDER BY created_at ASC
+    </select>
 </mapper>