diff --git a/src/main/java/com/threecloud/dataserviceyy/entity/MidVoiceDeviceLog.java b/src/main/java/com/threecloud/dataserviceyy/entity/MidVoiceDeviceLog.java
new file mode 100644
index 0000000..1179e7e
--- /dev/null
+++ b/src/main/java/com/threecloud/dataserviceyy/entity/MidVoiceDeviceLog.java
@@ -0,0 +1,79 @@
+package com.threecloud.dataserviceyy.entity;
+
+import java.util.Date;
+
+/**
+ * 设备连接日志表
+ * 对应 mid_voice.mid_voice_device_log
+ * 
+ * 用于记录设备连接失败信息，便于排查问题
+ */
+public class MidVoiceDeviceLog {
+    
+    /** 自增ID主键 */
+    private Long id;
+    
+    /** 设备ID */
+    private String deviceId;
+    
+    /** 设备编号 */
+    private String deviceNo;
+    
+    /** 地市编码 */
+    private String cityCode;
+    
+    /** 地市名称 */
+    private String cityName;
+    
+    /** IP地址 */
+    private String ipAddress;
+    
+    /** 端口号 */
+    private Integer devicePort;
+    
+    /** 连接类型：1登录，2查询录音列表，3下载文件 */
+    private String connectType;
+    
+    /** 连接状态：0失败，1成功 */
+    private String connectStatus;
+    
+    /** 失败原因 */
+    private String failReason;
+    
+    /** 创建时间 */
+    private Date createTime;
+
+    // Getters and Setters
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+    
+    public String getDeviceId() { return deviceId; }
+    public void setDeviceId(String deviceId) { this.deviceId = deviceId; }
+    
+    public String getDeviceNo() { return deviceNo; }
+    public void setDeviceNo(String deviceNo) { this.deviceNo = deviceNo; }
+    
+    public String getCityCode() { return cityCode; }
+    public void setCityCode(String cityCode) { this.cityCode = cityCode; }
+    
+    public String getCityName() { return cityName; }
+    public void setCityName(String cityName) { this.cityName = cityName; }
+    
+    public String getIpAddress() { return ipAddress; }
+    public void setIpAddress(String ipAddress) { this.ipAddress = ipAddress; }
+    
+    public Integer getDevicePort() { return devicePort; }
+    public void setDevicePort(Integer devicePort) { this.devicePort = devicePort; }
+    
+    public String getConnectType() { return connectType; }
+    public void setConnectType(String connectType) { this.connectType = connectType; }
+    
+    public String getConnectStatus() { return connectStatus; }
+    public void setConnectStatus(String connectStatus) { this.connectStatus = connectStatus; }
+    
+    public String getFailReason() { return failReason; }
+    public void setFailReason(String failReason) { this.failReason = failReason; }
+    
+    public Date getCreateTime() { return createTime; }
+    public void setCreateTime(Date createTime) { this.createTime = createTime; }
+}
diff --git a/src/main/java/com/threecloud/dataserviceyy/mapper/MidVoiceDeviceLogMapper.java b/src/main/java/com/threecloud/dataserviceyy/mapper/MidVoiceDeviceLogMapper.java
new file mode 100644
index 0000000..d41fd32
--- /dev/null
+++ b/src/main/java/com/threecloud/dataserviceyy/mapper/MidVoiceDeviceLogMapper.java
@@ -0,0 +1,47 @@
+package com.threecloud.dataserviceyy.mapper;
+
+import com.threecloud.dataserviceyy.entity.MidVoiceDeviceLog;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
+
+import java.util.List;
+
+/**
+ * 设备连接日志 Mapper
+ */
+@Mapper
+public interface MidVoiceDeviceLogMapper {
+
+    /**
+     * 插入设备连接日志
+     */
+    @Insert("INSERT INTO mid_voice_device_log (" +
+            "device_id, device_no, city_code, city_name, ip_address, device_port, " +
+            "connect_type, connect_status, fail_reason, create_time" +
+            ") VALUES (" +
+            "#{deviceId}, #{deviceNo}, #{cityCode}, #{cityName}, #{ipAddress}, #{devicePort}, " +
+            "#{connectType}, #{connectStatus}, #{failReason}, #{createTime}" +
+            ")")
+    int insert(MidVoiceDeviceLog log);
+
+    /**
+     * 查询设备的最近连接日志
+     */
+    @Select("SELECT * FROM mid_voice_device_log " +
+            "WHERE device_id = #{deviceId} " +
+            "ORDER BY create_time DESC " +
+            "LIMIT #{limit}")
+    List<MidVoiceDeviceLog> selectRecentByDeviceId(@Param("deviceId") String deviceId, 
+                                                    @Param("limit") int limit);
+
+    /**
+     * 查询失败的连接记录
+     */
+    @Select("SELECT * FROM mid_voice_device_log " +
+            "WHERE connect_status = '0' " +
+            "AND create_time >= #{startTime} " +
+            "ORDER BY create_time DESC")
+    List<MidVoiceDeviceLog> selectFailedLogs(@Param("startTime") String startTime);
+}