diff --git a/unity/Assets/core/upm/Editor/Resources/puerts/xil2cpp/Puerts_il2cpp.cpp.txt b/unity/Assets/core/upm/Editor/Resources/puerts/xil2cpp/Puerts_il2cpp.cpp.txt
index 9f9cbbe06e..861ad17b5b 100644
--- a/unity/Assets/core/upm/Editor/Resources/puerts/xil2cpp/Puerts_il2cpp.cpp.txt
+++ b/unity/Assets/core/upm/Editor/Resources/puerts/xil2cpp/Puerts_il2cpp.cpp.txt
@@ -13,6 +13,7 @@
 #include "il2cpp-api.h"
 #include "il2cpp-class-internals.h"
 #include "il2cpp-object-internals.h"
+#include "mono-structs.h"
 #include "vm/InternalCalls.h"
 #include "vm/Object.h"
 #include "vm/Array.h"
@@ -2473,6 +2474,45 @@ void DestroyJSEnvPrivate(JsEnvPrivate* jsEnvPrivate)
     delete jsEnvPrivate;
 }
 
+Il2CppClass* GenericParamGetBaseType(Il2CppMetadataGenericParameterHandle gparam)
+{
+    Il2CppClass** constraints = Class::GetOrCreateMonoGenericParameterInfo(gparam)->constraints;
+
+    Il2CppClass* base_class = il2cpp_defaults.object_class;
+
+    if (constraints)
+    {
+        for (int i = 0; constraints[i]; ++i)
+        {
+            Il2CppClass* constraint = constraints[i];
+
+            if (Class::IsInterface(constraint))
+                continue;
+
+            Il2CppType* constraint_type = &constraint->byval_arg;
+            if (constraint_type->type == IL2CPP_TYPE_VAR || constraint_type->type == IL2CPP_TYPE_MVAR)
+            {
+                Il2CppMetadataGenericParameterHandle constraint_param = constraint_type->data.genericParameterHandle;
+                Il2CppGenericParameterInfo constraint_info = MetadataCache::GetGenericParameterInfo(constraint_param);
+                if ((constraint_info.flags & IL2CPP_GENERIC_PARAMETER_ATTRIBUTE_REFERENCE_TYPE_CONSTRAINT) == 0 &&
+                    (constraint_info.flags & IL2CPP_GENERIC_PARAMETER_ATTRIBUTE_NOT_NULLABLE_VALUE_TYPE_CONSTRAINT) == 0)
+                    continue;
+            }
+
+            base_class = constraint;
+        }
+    }
+
+    if (base_class == il2cpp_defaults.object_class)
+    {
+        Il2CppGenericParameterInfo gparamInfo = MetadataCache::GetGenericParameterInfo(gparam);
+        if ((gparamInfo.flags & IL2CPP_GENERIC_PARAMETER_ATTRIBUTE_NOT_NULLABLE_VALUE_TYPE_CONSTRAINT) != 0)
+            base_class = il2cpp_defaults.value_type_class;
+    }
+
+    return base_class;
+}
+
 static const MethodInfo* MakeGenericMethodByConstraintedArguments(const MethodInfo* method)
 {
     if (!Method::IsGeneric(method) || Method::IsInflated(method))
@@ -2488,8 +2528,10 @@ static const MethodInfo* MakeGenericMethodByConstraintedArguments(const MethodIn
     for (uint32_t i = 0; i < count; i++)
     {
         Il2CppMetadataGenericParameterHandle param = GenericContainer::GetGenericParameter(containerHandle, i);
-        Il2CppClass* pklass = Class::FromGenericParameter(param);
-        genericArguments[i] = &(Class::GenericParamGetBaseType(pklass)->byval_arg);
+        //Il2CppClass* pklass = Class::FromGenericParameter(param);
+        //genericArguments[i] = &(Class::GenericParamGetBaseType(pklass)->byval_arg); // debug 下 GenericParamGetBaseType对于IL2CPP_TYPE_MVAR，其is_generic_argument判断很奇怪：type->type == IL2CPP_TYPE_VAR || type->type == IL2CPP_TYPE_VAR，疑似笔误，从2022到6000都一样
+        // 拷贝Class::GenericParamGetBaseType过来修改
+        genericArguments[i] = &(GenericParamGetBaseType(param)->byval_arg);
     }
     return MetadataCache::GetGenericInstanceMethod(method, genericArguments, count);
 }