diff --git a/src/serialization/impl/extern_c_opr.cpp b/src/serialization/impl/extern_c_opr.cpp
index 080b023eb27d19df5f560b9dc3a3e94f556bd23a..cdc36e0342eb47387534fe8b9492ed2a4925bd47 100644
--- a/src/serialization/impl/extern_c_opr.cpp
+++ b/src/serialization/impl/extern_c_opr.cpp
@@ -289,7 +289,9 @@ ExternCOprRunner::ExternCOprRunner(std::string& name,
           m_desc{std::move(desc)},
           m_dump_name{name},
           m_param{nullptr} {
-    mgb_assert(m_desc->size == sizeof(MGBOprDesc),
+    auto size_diff = sizeof(MGBOprDesc) - m_desc->size;
+    is_loader_support_dynamic_param = (0 == size_diff) ? true : false;
+    mgb_assert(0 == size_diff || sizeof(ExternCOprParam*) == size_diff,
                "invalid MGBOprDesc size: expect=%zu got=%u, may caused by "
                "extern_c_opr.h mismatch, please confirm that the "
                "extern_c_opr.h used when compiling the loader is consistent "
@@ -345,6 +347,8 @@ void ExternCOprRunner::check_param() {
     //! ExternDeviceTensor for some case, ExternCOprParam may only config
     //! device_id, extra_info, etc. so we need consider nr_input=0 or
     //! nr_output=0
+    if (!is_loader_support_dynamic_param)
+        return;
     auto check = [](size_t nr_config_tensor, size_t var_node_size,
                     ExternDeviceTensor* e_tensor,
                     const VarNodeArray& var_node_array, const char* msg) {
diff --git a/src/serialization/include/megbrain/serialization/extern_c_opr_io.h b/src/serialization/include/megbrain/serialization/extern_c_opr_io.h
index f6fb39ec8824f6d193a60cfb09cc2c336e083179..522d9089cf345ea04f0b3927f87d37e22d9543ce 100644
--- a/src/serialization/include/megbrain/serialization/extern_c_opr_io.h
+++ b/src/serialization/include/megbrain/serialization/extern_c_opr_io.h
@@ -33,6 +33,7 @@ MGB_DEFINE_OPR_CLASS(ExternCOprRunner,
     void add_input_layout_constraint() override;
     void init_output_dtype() override;
     void check_param();
+    bool is_loader_support_dynamic_param;
 
     static cg::OperatorNodeBase* make_from_desc_shared(
             std::string& name, const VarNodeArray& inputs,
@@ -98,6 +99,8 @@ public:
     }
 
     void set_param(const std::shared_ptr<ExternCOprParam>& param) {
+        mgb_assert(is_loader_support_dynamic_param,
+                   "set_param function need loader imp dynamic_param");
         m_param = param;
         m_desc->dynamic_param = m_param.get();
     }