diff --git a/include/constant.h b/include/constant.h
index 480843c..3bc8dbb 100644
--- a/include/constant.h
+++ b/include/constant.h
@@ -1,11 +1,12 @@
 #ifndef CONSTANT_H_
 #define CONSTANT_H_
 
-#define VERSION "1.3.0-dev"
-
 #define TRUE  1
 #define FALSE 0
 
+#define VERSION "1.3.0-dev"
+#define CONFIG_FILE "test.yml"
+
 #define DNS_PORT      53
 #define ADGUARD_PORT  80
 #define DIVERTER_PORT 5353
@@ -15,22 +16,31 @@
 #define DIVERTER_TIMEOUT 6
 
 #define ADGUARD_USER   "admin"
-#define ADGUARD_PASSWD "adguard"
+#define ADGUARD_PASSWD "cleardns"
 
 #define DNSPROXY_BIN "dnsproxy"
 #define OVERTURE_BIN "overture"
 #define ADGUARD_BIN  "AdGuardHome"
-#define ASSETS_PKG   "/assets.tar.xz"
 
 #define EXPOSE_DIR  "/cleardns/"
 #define WORK_DIR    "/etc/cleardns/"
 #define ASSETS_DIR  "/cleardns/assets/"
 #define ADGUARD_DIR "/cleardns/adguard/"
 
+#define UPDATE_CRON      "0 4 * * *"
+#define ASSETS_PKG       "/assets.tar.xz"
+
 #define ASSET_TTL        "ttl.txt"
 #define ASSET_HOSTS      "hosts.txt"
 #define ASSET_GFW_LIST   "gfwlist.txt"
 #define ASSET_CHINA_IP   "china-ip.txt"
 #define ASSET_CHINA_LIST "chinalist.txt"
 
+#define HELP_MSG "\
+ClearDNS usage \n\
+--debug ...\n\
+--config ...\n\
+--help ...\n\
+"
+
 #endif
diff --git a/include/loader/config.h b/include/loader/config.h
index cbb1657..760b50b 100644
--- a/include/loader/config.h
+++ b/include/loader/config.h
@@ -32,6 +32,12 @@ typedef struct {
     char *password;
 } adguard_config;
 
+typedef struct {
+    char *cron;
+    char **update_file;
+    char **update_url;
+} assets_config;
+
 typedef struct {
     uint16_t port;
     cache_config cache;
@@ -39,6 +45,7 @@ typedef struct {
     upstream_config foreign;
     diverter_config diverter;
     adguard_config adguard;
+    assets_config assets;
     uint32_t **reject;
     char **hosts;
     char **ttl;
diff --git a/include/loader/loader.h b/include/loader/loader.h
index 7661b8b..c455f70 100644
--- a/include/loader/loader.h
+++ b/include/loader/loader.h
@@ -1,16 +1,18 @@
 #ifndef LOADER_H_
 #define LOADER_H_
 
+#include "config.h"
 #include "adguard.h"
 #include "dnsproxy.h"
 #include "overture.h"
 
 struct cleardns {
+    char **script;
     dnsproxy *domestic;
     dnsproxy *foreign;
     overture *diverter;
     adguard *filter;
-    char **script;
+    assets_config *assets;
 };
 
 extern struct cleardns loader;
diff --git a/src/cleardns.c b/src/cleardns.c
index d65a561..9f1a975 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -11,15 +11,6 @@
 #include "system.h"
 #include "sundry.h"
 
-#define HELP_MSG "\
-ClearDNS usage \n\
---debug ...\n\
---config ...\n\
---help ...\n\
-"
-
-#define CONFIG_FILE "test.json"
-
 char* init(int argc, char *argv[]) { // return config file
     char *config = string_init(CONFIG_FILE);
     for (int i = 0; i < argc; ++i) {
@@ -47,8 +38,7 @@ char* init(int argc, char *argv[]) { // return config file
     return config;
 }
 
-
-int main(int argc, char *argv[]) { // ClearDNS server
+int main(int argc, char *argv[]) { // ClearDNS service
 
     char *config_file = init(argc, argv);
 
@@ -56,26 +46,22 @@ int main(int argc, char *argv[]) { // ClearDNS server
     log_info("ClearDNS server start (%s)", VERSION);
 
 //    process *test = process_init("TEST", "lls");
-    process *test = process_init("TEST", "ls");
-
-    process_add_arg(test, "-al");
-
+//    process *test = process_init("TEST", "ls");
+//    process_add_arg(test, "-al");
 //    test->cwd = "/etc/cleardns/fuck";
+//    int pid = process_exec(test);
+//    log_info("PID = %d", pid);
 
-    int pid = process_exec(test);
-
-    log_info("PID = %d", pid);
-
-    int status;
-    wait(&status);
-
-    return 0;
+//    int status;
+//    wait(&status);
+//    return 0;
 
     create_folder(WORK_DIR);
 
-//    load_config(config_file);
-//    free(config_file);
-//
+    // TODO: load assets first
+    load_config(config_file);
+    free(config_file);
+
 //    process_list_init();
 //    process_list_append(dnsproxy_load("Domestic", loader.domestic, "domestic.json"));
 //    process_list_append(dnsproxy_load("Foreign", loader.foreign, "foreign.json"));
@@ -86,7 +72,7 @@ int main(int argc, char *argv[]) { // ClearDNS server
 
     // TODO: running custom script
 
-    process_list_run();
+//    process_list_run();
 
 
 //    init_server(init_script, custom_script); // run init script and custom script
diff --git a/src/common/structure.c b/src/common/structure.c
index 0229cf9..90b89cb 100644
--- a/src/common/structure.c
+++ b/src/common/structure.c
@@ -17,6 +17,7 @@ uint32_t string_list_len(char **string_list) { // get len of string list
     return num - 1;
 }
 
+// TODO: use char *** with void return
 char** string_list_append(char **string_list, const char *string) { // add new string at the end of list
     uint32_t len = string_list_len(string_list);
     string_list = (char **)realloc(string_list, sizeof(char *) * (len + 2)); // extend string list
diff --git a/src/loader/CMakeLists.txt b/src/loader/CMakeLists.txt
index 90e826d..4969c3a 100644
--- a/src/loader/CMakeLists.txt
+++ b/src/loader/CMakeLists.txt
@@ -1,4 +1,4 @@
 cmake_minimum_required(VERSION 2.8.12)
 
 add_library(loader config.c default.c loader.c parser.c)
-target_link_libraries(loader applet)
+target_link_libraries(loader applet common)
diff --git a/src/loader/config.c b/src/loader/config.c
index 61741a0..89a452e 100644
--- a/src/loader/config.c
+++ b/src/loader/config.c
@@ -36,6 +36,10 @@ cleardns_config* config_init() { // init config struct of cleardns
     config->adguard.username = string_init(ADGUARD_USER);
     config->adguard.password = string_init(ADGUARD_PASSWD);
 
+    config->assets.cron = string_init(UPDATE_CRON);
+    config->assets.update_file = string_list_init();
+    config->assets.update_url = string_list_init();
+
     config->reject = uint32_list_init();
     config->hosts = string_list_init();
     config->ttl = string_list_init();
@@ -73,6 +77,12 @@ void config_dump(cleardns_config *config) { // dump config info of cleardns
     log_debug("AdGuardHome username -> %s", config->adguard.username);
     log_debug("AdGuardHome password -> %s", config->adguard.password);
 
+    log_debug("Assets update cron -> `%s`", config->assets.cron);
+    for (char **file = config->assets.update_file; *file != NULL; ++file) { // show string mapping
+        char **url = file - config->assets.update_file + config->assets.update_url;
+        log_debug("Assets file `%s` -> %s", *file, *url);
+    }
+
     uint32_list_debug("DNS reject type", config->reject);
     string_list_debug("Domain TTL", config->ttl);
     string_list_debug("Hosts", config->hosts);
diff --git a/src/loader/default.c b/src/loader/default.c
index 8f407f3..a1da955 100644
--- a/src/loader/default.c
+++ b/src/loader/default.c
@@ -40,6 +40,13 @@ foreign:\n\
   fallback:\n\
     - 1.1.1.1\n\
     - 8.8.4.4\n\
+\n\
+assets:\n\
+  cron: \"0 4 * * *\"\n\
+  update:\n\
+    gfwlist.txt: https://res.dnomd343.top/Share/gfwlist/gfwlist.txt\n\
+    china-ip.txt: https://res.dnomd343.top/Share/chinalist/china-ip.txt\n\
+    chinalist.txt: https://res.dnomd343.top/Share/chinalist/chinalist.txt\n\
 "
 
 void load_default_config(const char *config_file) {
diff --git a/src/loader/loader.c b/src/loader/loader.c
index 6d9b1bc..8b58ad4 100644
--- a/src/loader/loader.c
+++ b/src/loader/loader.c
@@ -117,6 +117,10 @@ void load_config(const char *config_file) {
     cleardns_config *config = config_init();
     load_default_config(config_file); // load default configure
     config_parser(config, config_file); // configure parser
+
+    // insert code (remove after test)
+    config->assets.update_file = string_list_append(config->assets.update_file, "geoip.dat");
+    config->assets.update_url = string_list_append(config->assets.update_url, "https://test.net/geoip.dat");
     config_dump(config);
 
     log_info("Loading configure options");
diff --git a/src/loader/parser.c b/src/loader/parser.c
index 3ea5581..5e19f7a 100644
--- a/src/loader/parser.c
+++ b/src/loader/parser.c
@@ -112,6 +112,24 @@ void adguard_parser(adguard_config *config, cJSON *json) { // adguard options pa
     }
 }
 
+void assets_parser(assets_config *config, cJSON *json) { // assets options parser
+
+    if (!cJSON_IsObject(json)) {
+        log_fatal("`assets` must be array");
+    }
+    json = json->child;
+    while (json != NULL) {
+        if (!strcmp(json->string, "cron")) {
+            config->cron = json_string_value("assets.cron", json);
+        }
+        if (!strcmp(json->string, "update")) {
+            log_warn("GET UPDATE KEY");
+            // TODO: get string map
+        }
+        json = json->next; // next field
+    }
+}
+
 void cleardns_parser(cleardns_config *config, const char *config_content) { // JSON format configure
     cJSON *json = cJSON_Parse(config_content);
     if (json == NULL) {
@@ -137,6 +155,9 @@ void cleardns_parser(cleardns_config *config, const char *config_content) { // J
         if (!strcmp(json->string, "adguard")) {
             adguard_parser(&config->adguard, json);
         }
+        if (!strcmp(json->string, "assets")) {
+            assets_parser(&config->assets, json);
+        }
         if (!strcmp(json->string, "reject")) {
             config->reject = json_uint32_list_value("reject", json, config->reject);
         }