diff --git a/config/Datas/test/test_null.xlsx b/config/Datas/test/test_null.xlsx
index 3e79a4e..df6a027 100644
Binary files a/config/Datas/test/test_null.xlsx and b/config/Datas/test/test_null.xlsx differ
diff --git a/src/Luban.Job.Cfg/Source/DataCreators/ExcelDataCreator.cs b/src/Luban.Job.Cfg/Source/DataCreators/ExcelDataCreator.cs
index 769afe8..a121ebc 100644
--- a/src/Luban.Job.Cfg/Source/DataCreators/ExcelDataCreator.cs
+++ b/src/Luban.Job.Cfg/Source/DataCreators/ExcelDataCreator.cs
@@ -354,7 +354,7 @@ namespace Luban.Job.Cfg.DataCreators
                     }
                     else if (subType != DefBean.BEAN_NOT_NULL_STR)
                     {
-                        throw new Exception($"type:{type.Bean.FullName} 可空标识 不合法（只能为{DefBean.BEAN_NOT_NULL_STR}或{DefBean.BEAN_NULL_STR})");
+                        throw new Exception($"type:{type.Bean.FullName} 可空标识:{subType} 不合法（只能为{DefBean.BEAN_NOT_NULL_STR}或{DefBean.BEAN_NULL_STR})");
                     }
                 }
                 return new DBean(originBean, originBean, CreateBeanFields(originBean, x, ass));
diff --git a/src/Luban.Job.Cfg/Source/DataCreators/ExcelNamedRowDataCreator.cs b/src/Luban.Job.Cfg/Source/DataCreators/ExcelNamedRowDataCreator.cs
index c8f93f0..576ccd6 100644
--- a/src/Luban.Job.Cfg/Source/DataCreators/ExcelNamedRowDataCreator.cs
+++ b/src/Luban.Job.Cfg/Source/DataCreators/ExcelNamedRowDataCreator.cs
@@ -210,7 +210,7 @@ namespace Luban.Job.Cfg.DataCreators
                     }
                     else if (subType != DefBean.BEAN_NOT_NULL_STR)
                     {
-                        throw new Exception($"type:{type.Bean.FullName} {DefBean.TYPE_NAME_KEY} 不合法（只能为{DefBean.BEAN_NOT_NULL_STR}或{DefBean.BEAN_NULL_STR})");
+                        throw new Exception($"type:{type.Bean.FullName} {DefBean.TYPE_NAME_KEY}:{subType} 不合法（只能为{DefBean.BEAN_NOT_NULL_STR}或{DefBean.BEAN_NULL_STR})");
                     }
                 }
 
diff --git a/src/Luban.Job.Cfg/Source/Defs/DefBean.cs b/src/Luban.Job.Cfg/Source/Defs/DefBean.cs
index 0f2fd48..8413894 100644
--- a/src/Luban.Job.Cfg/Source/Defs/DefBean.cs
+++ b/src/Luban.Job.Cfg/Source/Defs/DefBean.cs
@@ -12,7 +12,7 @@ namespace Luban.Job.Cfg.Defs
     {
         public const string TYPE_NAME_KEY = "__type__";
 
-        public const string BEAN_NULL_STR = "{null}";
+        public const string BEAN_NULL_STR = "null";
 
         public const string BEAN_NOT_NULL_STR = "{}";