diff --git a/src/Psc_Cpp_Core/Base/JSON.h b/src/Psc_Cpp_Core/Base/JSON.h
index 69206fa..fdfa86a 100644
--- a/src/Psc_Cpp_Core/Base/JSON.h
+++ b/src/Psc_Cpp_Core/Base/JSON.h
@@ -498,16 +498,14 @@ void output_field(const T& field, Psc::JSON& ret, const char* name) {
         return ret;                                                                                                    \
     }
 #define PSC_FROM_JSON                                                                                                  \
-    void from_base_json(const Psc::JSON* that_json, bool not_exist_use_default_value) {                                \
+    void from_base_json(const Psc::JSON* that_json) {                                                                  \
         using T = std::remove_cv_t<std::remove_pointer_t<decltype(this)>>;                                             \
         boost::pfr::for_each_field(                                                                                    \
         *this, [&, names = boost::pfr::names_as_array<T>(), i = std::size_t{}](auto& field) mutable {                  \
             auto name = names[i++].data();                                                                             \
             std::error_code ec;                                                                                        \
             auto t = Psc::assign_field_ec(field, that_json, name, ec);                                                 \
-            if (!not_exist_use_default_value) {                                                                        \
-                Psc::check_json_assign_field(t, ec, that_json, name);                                                  \
-            }                                                                                                          \
+            Psc::check_json_assign_field(t, ec, that_json, name);                                                      \
         });                                                                                                            \
     }
 #define PSC_USE_JSON                                                                                                   \