diff --git a/FreeSql.Tests/g.cs b/FreeSql.Tests/g.cs
index 79360ff6..1389dc61 100644
--- a/FreeSql.Tests/g.cs
+++ b/FreeSql.Tests/g.cs
@@ -17,26 +17,31 @@ public class g {
 			(cmd, traceLog) => {
 				Console.WriteLine(traceLog);
 			}) //监听SQL命令对象，在执行后
+		.UseLazyLoading(true)
 		.Build();
 
 	public static IFreeSql sqlserver = new FreeSql.FreeSqlBuilder()
 		.UseConnectionString(FreeSql.DataType.SqlServer, "Data Source=.;Integrated Security=True;Initial Catalog=cms;Pooling=true;Max Pool Size=10")
 		.UseAutoSyncStructure(true)
+		.UseLazyLoading(true)
 		.Build();
 
 	public static IFreeSql pgsql = new FreeSql.FreeSqlBuilder()
 		.UseConnectionString(FreeSql.DataType.PostgreSQL, "Host=192.168.164.10;Port=5432;Username=postgres;Password=123456;Database=tedb;Pooling=true;Maximum Pool Size=10")
 		.UseAutoSyncStructure(true)
 		.UseSyncStructureToLower(true)
+		.UseLazyLoading(true)
 		.Build();
 
 	public static IFreeSql oracle = new FreeSql.FreeSqlBuilder()
 		.UseConnectionString(FreeSql.DataType.Oracle, "user id=user1;password=123456;data source=//127.0.0.1:1521/XE;Pooling=true;Max Pool Size=10")
 		.UseAutoSyncStructure(true)
+		.UseLazyLoading(true)
 		.Build();
 
 	public static IFreeSql sqlite = new FreeSql.FreeSqlBuilder()
 		.UseConnectionString(FreeSql.DataType.Sqlite, @"Data Source=|DataDirectory|\document.db;Attachs=xxxtb.db;Pooling=true;Max Pool Size=10")
 		.UseAutoSyncStructure(true)
+		.UseLazyLoading(true)
 		.Build();
 }
diff --git a/FreeSql/Internal/UtilsExpressionTree.cs b/FreeSql/Internal/UtilsExpressionTree.cs
index 6377c12c..6a556bd3 100644
--- a/FreeSql/Internal/UtilsExpressionTree.cs
+++ b/FreeSql/Internal/UtilsExpressionTree.cs
@@ -107,7 +107,7 @@ namespace FreeSql.Internal {
 
 				if (common.CodeFirst.IsLazyLoading && virtualProps.Any()) {
 					//virtual 属性延时加载，生态产生新的重写类
-					if (trytb.Type.IsNotPublic) throw new Exception("【延时加载】功能发生错误，实体类必须声明为 public");
+					if (trytb.Type.IsNestedPublic == false) throw new Exception("【延时加载】功能发生错误，实体类必须声明为 public");
 
 					var overrieds = 0;
 					var cscode = new StringBuilder();