diff --git a/Falcon.SugarApi/DatabaseDefinitions/SugarConnectionConfig.cs b/Falcon.SugarApi/DatabaseDefinitions/SugarConnectionConfig.cs
index 6918e68..d7a5f84 100644
--- a/Falcon.SugarApi/DatabaseDefinitions/SugarConnectionConfig.cs
+++ b/Falcon.SugarApi/DatabaseDefinitions/SugarConnectionConfig.cs
@@ -22,11 +22,11 @@ namespace Falcon.SugarApi.DatabaseDefinitions
             this.ConfigureExternalServices ??= new ConfigureExternalServices { };
             //设置Nullable
             this.ConfigureExternalServices.EntityService += (p, c) => {
-                var pt = p.PropertyType;
-                if (pt.GetCustomAttribute<RequiredAttribute>() != null) {
+                if (p.GetCustomAttribute<RequiredAttribute>() != null) {
                     c.IsNullable = false;
                     return;
                 }
+                var pt = p.PropertyType;
                 if (pt.IsGenericType && pt.GetGenericTypeDefinition() == typeof(Nullable<>)) {
                     c.IsNullable = true;
                     return;