diff --git a/BUILD.gn b/BUILD.gn
index da7c411..0ec3f16 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -18,6 +18,10 @@ import("config.gni")
 config("internal") {
   include_dirs = [ "include" ]
   include_dirs += [ syscap_codec_config_path ]
+  if (syscap_codec_config_extern_path != "") {
+    include_dirs += [ "${root_build_dir}" ]
+    cflags = [ "-DSYSCAP_DEFINE_EXTERN_ENABLE" ]
+  }
 }
 
 sources_platform_common = [
@@ -27,6 +31,10 @@ sources_platform_common = [
 ]
 
 ohos_executable("syscap_tool_bin") {
+  if (syscap_codec_config_extern_path != "") {
+    deps = [ ":gen_syscap_define_custom" ]
+    inputs = [ "${root_build_dir}/syscap_define_custom.h" ]
+  }
   output_name = "syscap_tool"
   install_enable = true
   include_dirs = [ "src" ]
@@ -43,7 +51,7 @@ ohos_executable("syscap_tool_bin") {
   sources = [ "./src/main.c" ]
   sources += sources_platform_common
 
-  deps = [ "//third_party/bounds_checking_function:libsec_static" ]
+  deps += [ "//third_party/bounds_checking_function:libsec_static" ]
 
   if (defined(ohos_lite)) {
     deps += [ "//build/lite/config/component/cJSON:cjson_static" ]
@@ -65,6 +73,10 @@ if (defined(ohos_lite)) {
     }
   } else {
     shared_library("syscap_interface_shared") {
+      if (syscap_codec_config_extern_path != "") {
+        deps = [ ":gen_syscap_define_custom" ]
+        inputs = [ "${root_build_dir}/syscap_define_custom.h" ]
+      }
       _version_script = rebase_path("libsyscap_interface_shared.versionscript")
       if (!defined(ldflags)) {
         ldflags = []
@@ -83,7 +95,7 @@ if (defined(ohos_lite)) {
         "./src/syscap_tool.c",
       ]
 
-      deps = [
+      deps += [
         "//build/lite/config/component/cJSON:cjson_static",
         "//third_party/bounds_checking_function:libsec_static",
       ]
@@ -91,6 +103,10 @@ if (defined(ohos_lite)) {
   }
 } else {
   ohos_shared_library("syscap_interface_shared") {
+    if (syscap_codec_config_extern_path != "") {
+      deps = [ ":gen_syscap_define_custom" ]
+      inputs = [ "${root_build_dir}/syscap_define_custom.h" ]
+    }
     version_script = "libsyscap_interface_shared.versionscript"
     include_dirs = [ "src" ]
     configs = [ ":internal" ]
@@ -100,7 +116,7 @@ if (defined(ohos_lite)) {
       "./src/endian_internal.c",
       "./src/syscap_tool.c",
     ]
-    deps = [
+    deps += [
       "//third_party/bounds_checking_function:libsec_static",
       "//third_party/cJSON:cjson_static",
     ]
@@ -138,6 +154,24 @@ ohos_prebuilt_etc("PCID.sc") {
   part_name = "syscap_codec"
 }
 
+# generate syscap_define_custom.h
+action("gen_syscap_define_custom") {
+  script = "./tools/syscap_config_merge.py"
+  args = [
+    "--base",
+    rebase_path("include/codec_config/syscap_define.h"),
+    "--extern",
+    rebase_path(syscap_codec_config_extern_path),
+    "--output",
+    rebase_path("${root_build_dir}/syscap_define_custom.h"),
+  ]
+  inputs = [
+    "include/codec_config/syscap_define.h",
+    syscap_codec_config_extern_path,
+  ]
+  outputs = [ "${root_build_dir}/syscap_define_custom.h" ]
+}
+
 group("pcid_sc") {
   deps = [ ":PCID.sc" ]
 }
diff --git a/config.gni b/config.gni
index cbdf88c..198febf 100644
--- a/config.gni
+++ b/config.gni
@@ -9,10 +9,12 @@
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
-# limitations under the License.
+# limitations under the License.
 
 declare_args() {
   syscap_codec_config_path =
       # customization for head file syscap_define.h.
       "//developtools/syscap_codec/include/codec_config"
+  syscap_codec_config_extern_path =
+      "include/codec_config/syscap_define_extern.h"
 }
diff --git a/include/codec_config/syscap_define.h b/include/codec_config/syscap_define.h
index f5c4005..8a57b33 100644
--- a/include/codec_config/syscap_define.h
+++ b/include/codec_config/syscap_define.h
@@ -284,7 +284,7 @@ typedef enum SystemCapabilityNum {
     GRAPHIC_GRAPHIC_UTILS_LITE,
     WINDOW_WINDOW_MANAGER_LITE,
     // Add before here
-    SYSCAP_NUM_MAX = 960
+    SYSCAP_NUM_MAX = 500
 } SyscapNum;
 
 
diff --git a/include/codec_config/syscap_define_extern.h b/include/codec_config/syscap_define_extern.h
new file mode 100644
index 0000000..63e164d
--- /dev/null
+++ b/include/codec_config/syscap_define_extern.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SYSCAP_DEFINE_EXTERN_H
+#define SYSCAP_DEFINE_EXTERN_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+
+#ifndef SYSCAP_DEFINE_H
+#define SINGLE_SYSCAP_LEN (256 + 17)
+
+typedef struct SystemCapabilityWithNum {
+    char str[SINGLE_SYSCAP_LEN];
+    uint16_t num;
+} SyscapWithNum;
+
+#endif
+
+/*
+ * New SyscapNum must be added last and
+ * don't delete anyone, just comment after it.
+ */
+typedef enum SystemCapabilityNumExtern {
+    SYSCAP_EXTERN_BEGIN = 500,
+    ENUM_SYSCAP_AAA,
+    ENUM_SYSCAP_BBB,
+    ENUM_SYSCAP_CCC,
+    // Add before here
+    SYSCAP_EXTERN_NUM_MAX = 960
+} SyscapNumExtern;
+
+
+/* Sort by SyscapNum */
+const static SyscapWithNum g_arraySyscapExtern[] = {
+    {"SystemCapability.AAA.AAAA", ENUM_SYSCAP_AAA},
+    {"SystemCapability.BBB.BBBB", ENUM_SYSCAP_BBB},
+    {"SystemCapability.CCC.CCCC", ENUM_SYSCAP_CCC},
+};
+
+uint32_t g_arraySyscapExternNum = sizeof(g_arraySyscapExtern) / sizeof(SyscapWithNum);
+
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+#endif  // SYSCAP_DEFINE_EXTERN_H
diff --git a/interfaces/inner_api/syscap_interface.c b/interfaces/inner_api/syscap_interface.c
index bf8372d..01ad4ea 100644
--- a/interfaces/inner_api/syscap_interface.c
+++ b/interfaces/inner_api/syscap_interface.c
@@ -22,11 +22,16 @@
 #include <securec.h>
 #include <limits.h>
 #include "cJSON.h"
-#include "syscap_define.h"
 #include "syscap_tool.h"
 #include "endian_internal.h"
 #include "syscap_interface.h"
 
+#ifdef SYSCAP_DEFINE_EXTERN_ENABLE
+#include "syscap_define_custom.h"
+#else
+#include "syscap_define.h"
+#endif
+
 #define OS_SYSCAP_BYTES 120
 #define SYSCAP_PREFIX_LEN 17
 #define SINGLE_FEAT_LEN (SINGLE_SYSCAP_LEN - SYSCAP_PREFIX_LEN)
diff --git a/napi/BUILD.gn b/napi/BUILD.gn
index d10bbdf..4a23966 100644
--- a/napi/BUILD.gn
+++ b/napi/BUILD.gn
@@ -46,6 +46,13 @@ ohos_shared_library("systemcapability") {
     "//third_party/bounds_checking_function:libsec_static",
   ]
 
+  if (syscap_codec_config_extern_path != "") {
+    deps += [ "..:gen_syscap_define_custom" ]
+    inputs = [ "${root_build_dir}/syscap_define_custom.h" ]
+    include_dirs += [ "${root_build_dir}" ]
+    cflags = [ "-DSYSCAP_DEFINE_EXTERN_ENABLE" ]
+  }
+
   external_deps = [ "napi:ace_napi" ]
 
   if (defined(ohos_lite)) {
diff --git a/src/create_pcid.c b/src/create_pcid.c
index 8ef9321..ee66a22 100644
--- a/src/create_pcid.c
+++ b/src/create_pcid.c
@@ -23,9 +23,14 @@
 #include "securec.h"
 #include "cJSON.h"
 #include "endian_internal.h"
-#include "syscap_define.h"
 #include "create_pcid.h"
 
+#ifdef SYSCAP_DEFINE_EXTERN_ENABLE
+#include "syscap_define_custom.h"
+#else
+#include "syscap_define.h"
+#endif
+
 #define SYSCAP_PREFIX_LEN 17
 #define SINGLE_FEAT_LEN (SINGLE_SYSCAP_LEN - SYSCAP_PREFIX_LEN)
 #define PCID_OUT_BUFFER 32
diff --git a/src/syscap_tool.c b/src/syscap_tool.c
index 01f1802..4ec5be2 100644
--- a/src/syscap_tool.c
+++ b/src/syscap_tool.c
@@ -24,10 +24,15 @@
 #include "securec.h"
 #include "endian_internal.h"
 #include "cJSON.h"
-#include "syscap_define.h"
 #include "create_pcid.h"
 #include "syscap_tool.h"
 
+#ifdef SYSCAP_DEFINE_EXTERN_ENABLE
+#include "syscap_define_custom.h"
+#else
+#include "syscap_define.h"
+#endif
+
 typedef struct RequiredProductCompatibilityIDHead {
     uint16_t apiVersion : 15;
     uint16_t apiVersionType : 1;
diff --git a/tools/syscap_config_merge.py b/tools/syscap_config_merge.py
new file mode 100755
index 0000000..4154d1e
--- /dev/null
+++ b/tools/syscap_config_merge.py
@@ -0,0 +1,143 @@
+#! /usr/bin/python3
+'''
+注意：
+1. base 的枚举定义，须在末尾标记最大值。
+2. extern 的枚举定义，须在开始位置标记最大值。
+3. base 的 syscap 数组，必须以逗号(),)结尾。
+'''
+import argparse
+
+licence = '''/*
+ * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+'''
+
+before_enum = '''#ifndef SYSCAP_DEFINE_H
+#define SYSCAP_DEFINE_H
+
+#include <stdint.h>
+
+#define SINGLE_SYSCAP_LEN (256 + 17)
+#ifdef __cplusplus
+#if __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+
+typedef struct SystemCapabilityWithNum {
+    char str[SINGLE_SYSCAP_LEN];
+    uint16_t num;
+} SyscapWithNum;
+
+/*
+ * New SyscapNum must be added last and
+ * don't delete anyone, just comment after it.
+ */
+'''
+
+after_struct = '''
+#ifdef __cplusplus
+#if __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* __cplusplus */
+#endif  // SYSCAP_DEFINE_H
+'''
+
+def gen_define_enum(enum:list):
+    header = 'typedef enum SystemCapabilityNum {\n'
+    tail = '} SyscapNum;\n\n'
+    trunk = ''.join(enum)
+    return header + trunk + tail
+
+
+def gen_define_array(stru:list):
+    header = 'const static SyscapWithNum g_arraySyscap[] = {\n'
+    tail = '};\n\n'
+    trunk = ''.join(stru)
+    return header + trunk + tail
+
+
+def read_syscap(path):
+    syscap_enum = []
+    op_flag = False
+    with open(path, 'r') as fb:
+        f = fb.readlines()
+    for line in f:
+        if line.startswith('typedef enum '):
+            op_flag = True
+            continue
+        elif op_flag and line.startswith('}'):
+            break
+        if op_flag:
+            syscap_enum.append(line)
+
+    syscap_stru = []
+    op_flag = False
+    for line in f:
+        if line.startswith('const static SyscapWithNum '):
+            op_flag = True
+            continue
+        elif op_flag and line.startswith('}'):
+            op_flag = False
+            break
+        if op_flag:
+            syscap_stru.append(line)
+
+    return syscap_enum, syscap_stru
+            
+
+def merge_define(base, extern):
+    base_enmu, base_stru = read_syscap(base)
+    ext_enmu, ext_stru = read_syscap(extern)
+    
+    if '500' in base_enmu[-1] and '500,' in ext_enmu[0]:
+        res_enmu = base_enmu[:-1] + ext_enmu
+    else:
+        res_enmu = base_enmu + ext_enmu
+    
+    res_stru = base_stru + ext_stru
+    return res_enmu, res_stru
+
+
+def assemble_header_file(fenum, fstru):
+    enum, stru = merge_define(fenum, fstru)
+    enum_def = gen_define_enum(enum)
+    stru_def = gen_define_array(stru)
+    return licence + before_enum + enum_def + stru_def + after_struct
+
+
+def parse_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--base',
+                        help='base syscap config header.')
+    parser.add_argument('--extern',
+                        help='extern syscap config header.')
+    parser.add_argument('--output',
+                        help='output app file')
+    arguments = parser.parse_args()
+    return arguments
+
+
+if __name__ == '__main__':
+    args = parse_args()
+    base_file = args.base
+    extern_file = args.extern
+    output_file = args.output
+    
+    full = assemble_header_file(base_file, extern_file)
+    with open(output_file, 'w') as out:
+        out.writelines(full)
+