diff --git a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
index baf18df27..88c9ba13c 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
@@ -1240,6 +1240,16 @@ namespace SqlSugar
                 string sql = "SAMPLE BY " + timeNumber + sampleBy.ToString().Substring(0, 1);
                 this.QueryBuilder.SampleBy = sql;
             }
+            else if (timeType == SampleByUnit.Millisecond)
+            {
+                string sql = "SAMPLE BY " + timeNumber + " T ";
+                this.QueryBuilder.SampleBy = sql;
+            }
+            else if (timeType == SampleByUnit.Microsecond)
+            {
+                string sql = "SAMPLE BY " + timeNumber + " U ";
+                this.QueryBuilder.SampleBy = sql;
+            }
             else
             {
                 string sql = "SAMPLE BY "+timeNumber + sampleBy.ToString().Substring(0, 1).ToLower();
diff --git a/Src/Asp.Net/SqlSugar/Enum/SampleByUnit.cs b/Src/Asp.Net/SqlSugar/Enum/SampleByUnit.cs
index 2cf743b6b..5f36fa041 100644
--- a/Src/Asp.Net/SqlSugar/Enum/SampleByUnit.cs
+++ b/Src/Asp.Net/SqlSugar/Enum/SampleByUnit.cs
@@ -11,6 +11,8 @@ namespace SqlSugar
         Hour,
         Day,
         Month,
-        Year
+        Year,
+        Millisecond,
+        Microsecond,
     }
 }
diff --git a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
index 84e4b47be..d025ab283 100644
--- a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
+++ b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>SqlSugarCore</id>
-    <version>5.1.4.155-preview10</version>
+    <version>5.1.4.155-preview18</version>
     <authors>sunkaixuan</authors>
     <owners>果糖大数据科技</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>