diff --git a/src/CncCollector/Core/CollectRecordWriter.cs b/src/CncCollector/Core/CollectRecordWriter.cs
index 98e34b2..ca5ab98 100644
--- a/src/CncCollector/Core/CollectRecordWriter.cs
+++ b/src/CncCollector/Core/CollectRecordWriter.cs
@@ -182,5 +182,112 @@ namespace CncCollector.Core
                 _log.Error($"记录采集失败状态时出错（address_id={collectAddressId}）", ex);
             }
         }
+
+        /// <summary>
+        /// 重放模式批量写入：日志已存在，跳过INSERT，改为UPDATE analysis_summary。
+        /// 其余步骤（写采集记录、更新机床状态、更新地址状态）保持不变。
+        /// </summary>
+        public static void WriteBatchReplay(string businessConnStr, string logConnStr,
+            List<CollectRecord> records, long existingRawLogId, int collectAddressId,
+            DateTime requestTime, string analysisSummary)
+        {
+            var now = DateTime.Now;
+
+            // 1. 更新已有日志的 analysis_summary
+            try
+            {
+                using (var conn = new MySqlConnection(logConnStr))
+                {
+                    conn.Open();
+                    conn.Execute(
+                        "UPDATE log_collect_raw SET analysis_summary = @Summary WHERE id = @Id",
+                        new { Id = existingRawLogId, Summary = analysisSummary ?? (string)null });
+                }
+            }
+            catch (Exception ex)
+            {
+                _log.Error($"重放：更新分析日志失败（raw_log_id={existingRawLogId}）", ex);
+            }
+
+            if (records == null || records.Count == 0) return;
+
+            // 2-4 步：与 WriteBatch 相同
+            try
+            {
+                using (var conn = new MySqlConnection(businessConnStr))
+                {
+                    conn.Open();
+                    using (var tran = conn.BeginTransaction())
+                    {
+                        try
+                        {
+                            foreach (var r in records)
+                            {
+                                conn.Execute(@"INSERT INTO cnc_collect_record (machine_id, collect_time, device_time, program_name, part_count, 
+                                    device_status, run_status, operate_mode, 
+                                    power_on_time, run_time, extra_data, created_at)
+                                    VALUES (@MachineId, @CollectTime, @DeviceTime, @ProgramName, @PartCount, 
+                                    @DeviceStatus, @RunStatus, @OperateMode, 
+                                    @PowerOnTime, @RunTime, @ExtraData, @CreatedAt)",
+                                    new
+                                    {
+                                        r.MachineId,
+                                        CollectTime = r.CollectTime,
+                                        r.DeviceTime,
+                                        ProgramName = r.ProgramName ?? (string)null,
+                                        r.PartCount,
+                                        DeviceStatus = r.DeviceStatus ?? (string)null,
+                                        RunStatus = r.RunStatus ?? (string)null,
+                                        OperateMode = r.OperateMode ?? (string)null,
+                                        r.PowerOnTime,
+                                        r.RunTime,
+                                        ExtraData = r.ExtraData ?? (string)null,
+                                        CreatedAt = now
+                                    }, tran);
+                            }
+                            tran.Commit();
+                        }
+                        catch
+                        {
+                            tran.Rollback();
+                            throw;
+                        }
+                    }
+
+                    foreach (var r in records)
+                    {
+                        try
+                        {
+                            conn.Execute(@"UPDATE cnc_machine SET last_collect_time = @CollectTime, 
+                                last_device_status = @DeviceStatus, last_run_status = @RunStatus,
+                                last_program_name = @ProgramName, last_part_count = @PartCount,
+                                last_operate_mode = @OperateMode
+                                WHERE id = @MachineId",
+                                new {
+                                    r.MachineId, r.CollectTime,
+                                    DeviceStatus = r.DeviceStatus ?? (string)null,
+                                    RunStatus = r.RunStatus ?? (string)null,
+                                    ProgramName = r.ProgramName ?? (string)null,
+                                    r.PartCount,
+                                    OperateMode = r.OperateMode ?? (string)null
+                                });
+                        }
+                        catch (Exception ex) { _log.Error($"重放：更新机床状态失败（id={r.MachineId}）", ex); }
+                    }
+
+                    try
+                    {
+                        conn.Execute(@"UPDATE cnc_collect_address SET last_collect_time = @Time, last_collect_status = 'success', fail_count = 0, updated_at = NOW() 
+                            WHERE id = @Id",
+                            new { Time = now, Id = collectAddressId });
+                    }
+                    catch (Exception ex) { _log.Error($"重放：更新地址状态失败（id={collectAddressId}）", ex); }
+                }
+            }
+            catch (Exception ex)
+            {
+                _log.Error($"重放：批量写入失败（raw_log_id={existingRawLogId}）", ex);
+            }
+        }
     }
 }