diff --git a/FrontendWebApi/ApiControllers/HistoryController.cs b/FrontendWebApi/ApiControllers/HistoryController.cs
index 143ee8f..b0ceef2 100644
--- a/FrontendWebApi/ApiControllers/HistoryController.cs
+++ b/FrontendWebApi/ApiControllers/HistoryController.cs
@@ -1436,6 +1436,35 @@ namespace FrontendWebApi.ApiControllers
                                             inner join variable v2 on temp.device_name_tag COLLATE utf8mb4_unicode_ci = v2.system_value and v2.deleted = 0 and v2.system_type = 'device_system_category_layer3'
                                             order by b.priority, v1.system_priority, v2.system_priority, temp.priority;";
 
+                int totalRecordCount = 0;
+
+                // 先計算總記錄數
+                foreach (var hi in input.HistoryItems)
+                {
+                    var device_number = hi.Device_number_point.Split(":")[0];
+                    var point = hi.Device_number_point.Split(":")[1];
+                    var stationName = await backendRepository.GetOneAsync<string>($"select distinct parent_path from import_niagara_item_history where device_building_tag = '{device_number.Split('_')[0]}' limit 1");
+                    var tableName = await backgroundServiceMsSqlRepository.GetOneAsync<string>($"select table_name from INFORMATION_SCHEMA.TABLES where table_name like '%{stationName}_{device_number}_{point}%'");
+
+                    if (!string.IsNullOrEmpty(tableName))
+                    {
+                        var sqlCount = $@"select count(*) from {tableName}
+                          where replace(convert(varchar, [timestamp], 111), '/', '-') >= @startTime 
+                            and replace(convert(varchar, [timestamp], 111), '/', '-') <= @endTime";
+
+                        var recordCount = await backgroundServiceMsSqlRepository.GetOneAsync<int>(sqlCount, new { startTime = input.Start_timestamp, endTime = input.End_timestamp });
+                        totalRecordCount += recordCount;
+
+                        if (totalRecordCount > 50000)
+                        {
+                            // 如果總記錄數超過5萬筆，返回提示信息
+                            apiResult.Code = "5000";
+                            apiResult.Msg = "資料量超過5萬筆，請減少選擇區間或設備";
+                            return apiResult;
+                        }
+                    }
+                }
+
                 foreach (var hi in input.HistoryItems)
                 {
                     var device_number = hi.Device_number_point.Split(":")[0];