diff --git a/FreeSql.Tests/FreeSql.Tests.Provider.TDengine/TDengine/TDengineIssue/TDengineIssueTest.cs b/FreeSql.Tests/FreeSql.Tests.Provider.TDengine/TDengine/TDengineIssue/TDengineIssueTest.cs
index 7a3181e9d..21c7de7c5 100644
--- a/FreeSql.Tests/FreeSql.Tests.Provider.TDengine/TDengine/TDengineIssue/TDengineIssueTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests.Provider.TDengine/TDengine/TDengineIssue/TDengineIssueTest.cs
@@ -41,12 +41,12 @@ namespace FreeSql.Tests.Provider.TDengine.TDengine.TDengineIssue
             var insertAffrows = _fsql.Insert(new TDengineProcessMetrics1977()
                 {
                     Timestamp = DateTime.Now,
-                    HostName = "host6"
+                    HostName = "host1",
+                    StartTime = DateTime.Now
                 }
             ).ExecuteAffrows();
             Assert.Equal(1, insertAffrows);
         }
-
     }
 
     public class TDengineProcessMetrics1977
@@ -67,6 +67,6 @@ namespace FreeSql.Tests.Provider.TDengine.TDengine.TDengineIssue
         /// 进程启动时间
         /// </summary>
         [Column(Name = "start_time")]
-        public DateTime StartTime { get; set; }
+        public DateTime? StartTime { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Providers/FreeSql.Provider.TDengine/TDengineProvider.cs b/Providers/FreeSql.Provider.TDengine/TDengineProvider.cs
index 09bc0b780..5cea4b753 100644
--- a/Providers/FreeSql.Provider.TDengine/TDengineProvider.cs
+++ b/Providers/FreeSql.Provider.TDengine/TDengineProvider.cs
@@ -52,17 +52,13 @@ namespace FreeSql.TDengine
                     case "TIMESTAMP":
                         try
                         {
-                            var value = e.DataReader.GetValue(e.Index);
-                            if (value != null)
-                                e.Value = e.DataReader.GetDateTime(e.Index);
-                            else
-                                e.Value = null;
-
+                            if (e.DataReader.IsDBNull(e.Index)) e.Value = null;
+                            else e.Value = e.DataReader.GetDateTime(e.Index);
                             return;
                         }
                         catch
                         {
-                            e.Value = new DateTime();
+                            e.Value = DateTime.MinValue;
                             return;
                         }
                 }