diff --git a/UnitTest/DataSource/DataTableHelper.cs b/UnitTest/DataSource/DataTableHelper.cs
new file mode 100644
index 00000000..7b008a10
--- /dev/null
+++ b/UnitTest/DataSource/DataTableHelper.cs
@@ -0,0 +1,23 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.Collections.Generic;
+
+namespace UnitTest.DataSource
+{
+    [TestClass]
+    public class DataTableHelper
+    {
+        [TestMethod]
+        public void ToDataTable()
+        {
+            var lst = new List<TestEntity.UserModel>();
+            var model = new TestEntity.UserModel();
+            model.ID = 100;
+            model.Age = null;
+            model.Name = "Test";
+            lst.Add(model);
+            var dt = XCLNetTools.DataSource.DataTableHelper.ToDataTable(lst);
+            Assert.IsTrue(null != dt && dt.Rows.Count == 1 && dt.Rows[0]["ID"].ToString() == "100" && dt.Rows[0]["Age"] == DBNull.Value && dt.Rows[0]["Name"].ToString() == "Test");
+        }
+    }
+}
\ No newline at end of file
diff --git a/UnitTest/Generic/ListHelper.cs b/UnitTest/Generic/ListHelper.cs
new file mode 100644
index 00000000..60b179bd
--- /dev/null
+++ b/UnitTest/Generic/ListHelper.cs
@@ -0,0 +1,26 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System;
+using System.Data;
+
+namespace UnitTest.Generic
+{
+    [TestClass]
+    public class ListHelper
+    {
+        [TestMethod]
+        public void DataTableToList()
+        {
+            var dt = new DataTable();
+            dt.Columns.Add("ID", typeof(int));
+            dt.Columns.Add("Age", typeof(int));
+            dt.Columns.Add("Name", typeof(string));
+            var dr = dt.NewRow();
+            dr["ID"] = 100;
+            dr["Age"] = DBNull.Value;
+            dr["Name"] = "Test";
+            dt.Rows.Add(dr);
+            var lst = XCLNetTools.Generic.ListHelper.DataTableToList<TestEntity.UserModel>(dt);
+            Assert.IsTrue(null != lst && lst.Count == 1 && lst[0].ID == 100 && lst[0].Age == null && lst[0].Name == "Test");
+        }
+    }
+}
\ No newline at end of file
diff --git a/UnitTest/TestEntity/UserModel.cs b/UnitTest/TestEntity/UserModel.cs
new file mode 100644
index 00000000..e1f1567e
--- /dev/null
+++ b/UnitTest/TestEntity/UserModel.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace UnitTest.TestEntity
+{
+    public class UserModel
+    {
+        public int ID { get; set; }
+        public int? Age { get; set; }
+        public string Name { get; set; }
+    }
+}
diff --git a/UnitTest/UnitTest.csproj b/UnitTest/UnitTest.csproj
index a14a58ae..eb4827c3 100644
--- a/UnitTest/UnitTest.csproj
+++ b/UnitTest/UnitTest.csproj
@@ -39,6 +39,7 @@
     <Reference Include="System.Core">
       <RequiredTargetFramework>3.5</RequiredTargetFramework>
     </Reference>
+    <Reference Include="System.Data" />
   </ItemGroup>
   <Choose>
     <When Condition="('$(VisualStudioVersion)' == '10.0' or '$(VisualStudioVersion)' == '') and '$(TargetFrameworkVersion)' == 'v3.5'">
@@ -56,8 +57,11 @@
   </Choose>
   <ItemGroup>
     <Compile Include="Common\SwitchControl.cs" />
+    <Compile Include="DataSource\DataTableHelper.cs" />
+    <Compile Include="Generic\ListHelper.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="StringHander\DateHelper.cs" />
+    <Compile Include="TestEntity\UserModel.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\XCLNetTools\XCLNetTools.csproj">
diff --git a/XCLNetTools/DataSource/DataTableHelper.cs b/XCLNetTools/DataSource/DataTableHelper.cs
index ce780182..7a234b49 100644
--- a/XCLNetTools/DataSource/DataTableHelper.cs
+++ b/XCLNetTools/DataSource/DataTableHelper.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Data;
 
 namespace XCLNetTools.DataSource
@@ -66,10 +67,12 @@ public static DataTable ToDataTable<T>(IList<T> data)
         {
             System.ComponentModel.PropertyDescriptorCollection properties = System.ComponentModel.TypeDescriptor.GetProperties(typeof(T));
             DataTable dt = new DataTable();
+            Type nullableType;
             for (int i = 0; i < properties.Count; i++)
             {
-                System.ComponentModel.PropertyDescriptor property = properties[i];
-                dt.Columns.Add(property.Name, property.PropertyType);
+                var property = properties[i];
+                nullableType = Nullable.GetUnderlyingType(property.PropertyType);
+                dt.Columns.Add(property.Name, null == nullableType ? property.PropertyType : nullableType);
             }
             object[] values = new object[properties.Count];
             foreach (T item in data)