diff --git a/CMakeLists.txt b/CMakeLists.txt
index 49253fb7..7304e380 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@ endif()
 
 if(${CMAKE_BUILD_TYPE} STREQUAL "Debug")
   message(STATUS "Enabling ubsan for Debug builds; Processor=${CMAKE_SYSTEM_PROCESSOR}")
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=undefined")
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
 
   if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "arm((32.*)|(v6.*)|(v7.*))")
     message(STATUS "Linking libatomic on arm32 machines..")
diff --git a/Makefile b/Makefile
index f3066062..21b1aaa1 100644
--- a/Makefile
+++ b/Makefile
@@ -34,8 +34,10 @@ build-unit-test:
 	cmake -Bbuild  -DBPFTIME_ENABLE_UNIT_TESTING=1 -DCMAKE_BUILD_TYPE:STRING=Debug
 	cmake --build build --config Debug --target bpftime_runtime_tests
 
-unit-test:
+unit-test: ## run catch2 unit tests
+	make -C runtime/test/bpf
 	./build/runtime/unit-test/bpftime_runtime_tests
+	cd build/runtime && ctest -VV
 
 build: ## build the package
 	cmake -Bbuild   -DBPFTIME_ENABLE_UNIT_TESTING=1
diff --git a/cmake/StandardSettings.cmake b/cmake/StandardSettings.cmake
index 6bceceb9..8020a70a 100644
--- a/cmake/StandardSettings.cmake
+++ b/cmake/StandardSettings.cmake
@@ -60,6 +60,6 @@ endif()
 
 option(BPFTIME_ENABLE_ASAN "Enable Address Sanitize to detect memory error." OFF)
 if(BPFTIME_ENABLE_ASAN)
-    add_compile_options(-fsanitize=address)
-    add_link_options(-fsanitize=address)
+    add_compile_options(-fsanitize=address,undefined)
+    add_link_options(-fsanitize=address,undefined)
 endif()
diff --git a/runtime/include/bpftime_shm.hpp b/runtime/include/bpftime_shm.hpp
index 485236ba..ca73626f 100644
--- a/runtime/include/bpftime_shm.hpp
+++ b/runtime/include/bpftime_shm.hpp
@@ -51,6 +51,8 @@ void bpftime_destroy_global_shm();
 int bpftime_import_global_shm_from_json(const char *filename);
 // export the global shared memory to json file
 int bpftime_export_global_shm_to_json(const char *filename);
+// import a hander to global shared memory from json string
+int bpftime_import_shm_handler_from_json(int fd, const char *json_string);
 
 // create a bpf link in the global shared memory
 //
diff --git a/runtime/src/bpftime_shm_json.cpp b/runtime/src/bpftime_shm_json.cpp
index c5fe0a45..0a003ced 100644
--- a/runtime/src/bpftime_shm_json.cpp
+++ b/runtime/src/bpftime_shm_json.cpp
@@ -64,19 +64,96 @@ bpf_perf_event_handler_to_json(const bpf_perf_event_handler &handler)
 
 extern "C" int bpftime_import_global_shm_from_json(const char *filename)
 {
-	assert(false && "Not implemented");
-	return -1;
+	return bpftime_import_shm_from_json(shm_holder.global_shared_memory,
+					    filename);
 }
 
-int bpftime::bpftime_import_shm_from_json(const bpftime_shm &shm,
+static int import_shm_handler_from_json(bpftime_shm &shm, json value, int fd)
+{
+	std::string handler_type = value["type"];
+	if (handler_type == "bpf_prog_handler") {
+		std::string insns_str = value["attr"]["insns"];
+		std::string name = value["attr"]["name"];
+		int type = value["attr"]["type"];
+		int cnt = value["attr"]["cnt"];
+		std::vector<ebpf_inst> insns;
+		insns.resize(cnt);
+		int res = hex_string_to_buffer(insns_str,
+					       (unsigned char *)insns.data(),
+					       insns_str.size());
+		if (res < 0) {
+			spdlog::error("Failed to parse insns in json");
+			return -1;
+		}
+		
+		shm.add_bpf_prog(fd, insns.data(), cnt, name.c_str(), type);
+	} else if (handler_type == "bpf_map_handler") {
+		std::string name = value["name"];
+		bpf_map_attr attr = json_to_bpf_map_attr(value["attr"]);
+		shm.add_bpf_map(fd, name.c_str(), attr);
+	} else if (handler_type == "bpf_perf_event_handler") {
+		int type = value["attr"]["type"];
+		int offset = value["attr"]["offset"];
+		int pid = value["attr"]["pid"];
+		int ref_ctr_off = value["attr"]["ref_ctr_off"];
+		std::string _module_name = value["attr"]["_module_name"];
+		int tracepoint_id = value["attr"]["tracepoint_id"];
+		switch ((bpf_perf_event_handler::bpf_event_type)type) {
+		case bpf_perf_event_handler::bpf_event_type::BPF_TYPE_UPROBE:
+			shm.add_uprobe(fd, pid, _module_name.c_str(), offset,
+				       false, ref_ctr_off);
+			break;
+		case bpf_perf_event_handler::bpf_event_type::BPF_TYPE_URETPROBE:
+			shm.add_uprobe(fd, pid, _module_name.c_str(), offset,
+				       true, ref_ctr_off);
+			break;
+		case bpf_perf_event_handler::bpf_event_type::PERF_TYPE_TRACEPOINT:
+			shm.add_tracepoint(fd, pid, tracepoint_id);
+			break;
+		default:
+			spdlog::error("Unsupported perf event type {}", type);
+			return -1;
+		}
+	} else if (handler_type == "bpf_link_handler") {
+		int prog_fd = value["attr"]["prog_fd"];
+		int target_fd = value["attr"]["target_fd"];
+		shm.add_bpf_link(fd, prog_fd, target_fd);
+	} else {
+		spdlog::error("Unsupported handler type {}", handler_type);
+		return -1;
+	}
+	return 0;
+}
+
+int bpftime::bpftime_import_shm_handler_from_json(bpftime_shm &shm, int fd,
+						  const char *json_string)
+{
+	json j = json::parse(json_string);
+	return import_shm_handler_from_json(shm, fd, j);
+}
+
+int bpftime::bpftime_import_shm_from_json(bpftime_shm &shm,
 					  const char *filename)
 {
-	return -1;
+	ifstream file(filename);
+	json j;
+	file >> j;
+	file.close();
+	for (auto &[key, value] : j.items()) {
+		int fd = std::stoi(key);
+		int res = import_shm_handler_from_json(shm, value, fd);
+		if (res < 0) {
+			spdlog::error("Failed to import handler from json");
+			return -1;
+		}
+	}
+	return 0;
 }
 
 extern "C" int bpftime_export_global_shm_to_json(const char *filename)
 {
-	return bpftime_export_shm_to_json(shm_holder.global_shared_memory, filename);
+	return bpftime_export_shm_to_json(shm_holder.global_shared_memory,
+					  filename);
 }
 
 int bpftime::bpftime_export_shm_to_json(const bpftime_shm &shm,
@@ -107,12 +184,20 @@ int bpftime::bpftime_export_shm_to_json(const bpftime_shm &shm,
 			// prog
 			j[std::to_string(i)] = {
 				{ "type", "bpf_prog_handler" },
-				{ "insns", buffer_to_hex_string(
-						   (const unsigned char *)insns,
-						   sizeof(ebpf_inst) * cnt) },
-				{ "cnt", cnt },
-				{ "name", name }
+				{ "attr",
+				  { "type", prog_handler.type },
+				  { "insns",
+				    buffer_to_hex_string(
+					    (const unsigned char *)insns,
+					    sizeof(ebpf_inst) * cnt) },
+				  { "cnt", cnt },
+				  { "name", name } }
 			};
+			// append attach fds to the json
+			for (auto &fd : prog_handler.attach_fds) {
+				j[std::to_string(i)]["attr"]["attach_fds"]
+					.push_back(fd);
+			}
 			spdlog::info("find prog fd={} name={}", i,
 				     prog_handler.name);
 		} else if (std::holds_alternative<bpf_map_handler>(handler)) {
@@ -131,7 +216,7 @@ int bpftime::bpftime_export_shm_to_json(const bpftime_shm &shm,
 				std::get<bpf_perf_event_handler>(handler);
 			j[std::to_string(i)] = {
 				{ "type", "bpf_perf_event_handler" },
-				{ "data",
+				{ "attr",
 				  bpf_perf_event_handler_to_json(perf_handler) }
 			};
 			spdlog::info("bpf_perf_event_handler found at {}", i);
@@ -142,8 +227,10 @@ int bpftime::bpftime_export_shm_to_json(const bpftime_shm &shm,
 		} else if (std::holds_alternative<bpf_link_handler>(handler)) {
 			auto &h = std::get<bpf_link_handler>(handler);
 			j[std::to_string(i)] = { { "type", "bpf_link_handler" },
-						 { "prog_fd", h.prog_fd },
-						 { "target_fd", h.target_fd } };
+						 { "attr",
+						   { "prog_fd", h.prog_fd },
+						   { "target_fd",
+						     h.target_fd } } };
 			spdlog::info(
 				"bpf_link_handler found at {}，link {} -> {}",
 				i, h.prog_fd, h.target_fd);
diff --git a/runtime/src/bpftime_shm_json.hpp b/runtime/src/bpftime_shm_json.hpp
index 977c39cd..a1040a18 100644
--- a/runtime/src/bpftime_shm_json.hpp
+++ b/runtime/src/bpftime_shm_json.hpp
@@ -36,7 +36,8 @@ static inline int hex_string_to_buffer(const std::string &hexString,
 }
 
 int bpftime_export_shm_to_json(const bpftime_shm& shm, const char *filename);
-int bpftime_import_shm_from_json(const bpftime_shm& shm, const char *filename);
-
+int bpftime_import_shm_from_json(bpftime_shm& shm, const char *filename);
+int bpftime_import_shm_handler_from_json(bpftime_shm &shm, int fd,
+					  const char *json_string);
 } // namespace bpftime
 #endif // BPFTIME_JSON_EXPORTER_HPP
diff --git a/runtime/src/handler/perf_event_handler.cpp b/runtime/src/handler/perf_event_handler.cpp
index d886784e..e33beaf5 100644
--- a/runtime/src/handler/perf_event_handler.cpp
+++ b/runtime/src/handler/perf_event_handler.cpp
@@ -46,6 +46,7 @@ bpf_perf_event_handler::bpf_perf_event_handler(
 {
 	this->_module_name = module_name;
 }
+
 // create uprobe/uretprobe with new perf event attr
 bpf_perf_event_handler::bpf_perf_event_handler(
 	bool is_retprobe, uint64_t offset, int pid, const char *module_name,
diff --git a/runtime/unit-test/test_bpftime_shm_json.cpp b/runtime/unit-test/test_bpftime_shm_json.cpp
index 4477225d..2b89e570 100644
--- a/runtime/unit-test/test_bpftime_shm_json.cpp
+++ b/runtime/unit-test/test_bpftime_shm_json.cpp
@@ -86,13 +86,13 @@ TEST_CASE("Test bpftime shm json import/export")
 
 	SECTION("Test shm json import")
 	{
-		// bpftime_shm shm2(SHM_NAME, shm_open_type::SHM_CLIENT);
-		// bpftime_import_shm_from_json(shm2,
-		//                  "/tmp/bpftime_test_shm_json.json");
-		// REQUIRE(shm2.get_bpf_prog(4) != nullptr);
-		// REQUIRE(shm2.get_tracepoint(5) != nullptr);
-		// REQUIRE(shm2.get_bpf_link(7) != nullptr);
-		// REQUIRE(shm2.get_bpf_map(8) != nullptr);
-		// REQUIRE(shm2.get_bpf_map(9) != nullptr);
+		bpftime_shm shm2(SHM_NAME, shm_open_type::SHM_CLIENT);
+		bpftime_import_shm_from_json(shm2,
+		                 "/tmp/bpftime_test_shm_json.json");
+		REQUIRE(shm2.is_prog_fd(4));
+		REQUIRE(shm2.is_perf_fd(5));
+		REQUIRE(shm2.is_exist_fake_fd(7));
+		REQUIRE(shm2.is_map_fd(8));
+		REQUIRE(shm2.is_map_fd(9));
 	}
 }