diff --git a/include/common/json.h b/include/common/json.h
index 054c03c..912463c 100644
--- a/include/common/json.h
+++ b/include/common/json.h
@@ -9,10 +9,11 @@ uint8_t is_json_suffix(const char *file_name);
 cJSON* json_field_get(cJSON *entry, const char *key);
 void json_field_replace(cJSON *entry, const char *key, cJSON *content);
 
-int json_int_value(char *key, cJSON *json);
-uint8_t json_bool_value(char *key, cJSON *json);
-char* json_string_value(char* key, cJSON *json);
-char** json_string_list_value(char *key, cJSON *json, char **string_list);
-uint32_t** json_uint32_list_value(char *key, cJSON *json, uint32_t **uint32_list);
+int json_int_value(char *caption, cJSON *json);
+uint8_t json_bool_value(char *caption, cJSON *json);
+char* json_string_value(char* caption, cJSON *json);
+char** json_string_list_value(char *caption, cJSON *json, char **string_list);
+uint32_t** json_uint32_list_value(char *caption, cJSON *json, uint32_t **uint32_list);
+void json_string_map_value(char *caption, cJSON *json, char ***key_list, char ***value_list);
 
 #endif
diff --git a/include/common/structure.h b/include/common/structure.h
index b74add1..e3ef304 100644
--- a/include/common/structure.h
+++ b/include/common/structure.h
@@ -7,8 +7,6 @@ char** string_list_init();
 void string_list_free(char **string_list);
 char* string_list_dump(char **string_list);
 uint32_t string_list_len(char **string_list);
-//char** string_list_update(char **base_list, char **update_list);
-//char** string_list_append(char **string_list, const char *string);
 void string_list_update(char ***base_list, char **update_list);
 void string_list_append(char ***string_list, const char *string);
 
@@ -17,8 +15,6 @@ char* uint32_list_dump(uint32_t **int_list);
 void uint32_list_free(uint32_t **uint32_list);
 uint32_t uint32_list_len(uint32_t **int_list);
 void uint32_list_append(uint32_t ***uint32_list, uint32_t number);
-//uint32_t** uint32_list_append(uint32_t **int_list, uint32_t number);
 void uint32_list_update(uint32_t ***base_list, uint32_t **update_list);
-//uint32_t** uint32_list_update(uint32_t **base_list, uint32_t **update_list);
 
 #endif
diff --git a/src/cleardns.c b/src/cleardns.c
index 271e6c1..b07818b 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -46,49 +46,6 @@ int main(int argc, char *argv[]) { // ClearDNS service
     LOG_LEVEL = LOG_DEBUG;
     log_info("ClearDNS server start (%s)", VERSION);
 
-//    char **test = string_list_init();
-//    log_info("len -> %u", string_list_len(test));
-//    string_list_append(&test, "test1");
-//    string_list_append(&test, "test2");
-//    string_list_append(&test, "test3");
-//    log_info("len -> %u", string_list_len(test));
-//
-//    char *temp = string_list_dump(test);
-//    log_info("content -> %s", temp);
-//    free(temp);
-//
-//    char **add = string_list_init();
-//    string_list_append(&add, "test4");
-//    string_list_append(&add, "test5");
-//
-//    string_list_update(&test, add);
-//    log_info("len -> %d", string_list_len(test));
-//    temp = string_list_dump(test);
-//    log_info("content -> %s", temp);
-//    free(temp);
-
-
-    uint32_t **test = uint32_list_init();
-    log_info("len -> %u", uint32_list_len(test));
-    uint32_list_append(&test, 1);
-    uint32_list_append(&test, 2);
-    uint32_list_append(&test, 3);
-    log_info("len -> %u", uint32_list_len(test));
-
-    char *temp = uint32_list_dump(test);
-    log_info("content -> %s", temp);
-    free(temp);
-
-    uint32_t **add = uint32_list_init();
-    uint32_list_append(&add, 4);
-    uint32_list_append(&add, 5);
-
-    uint32_list_update(&test, add);
-    log_info("len -> %d", uint32_list_len(test));
-    temp = uint32_list_dump(test);
-    log_info("content -> %s", temp);
-    free(temp);
-
 
 //    process *test = process_init("TEST", "lls");
 //    process *test = process_init("TEST", "ls");
@@ -101,11 +58,11 @@ int main(int argc, char *argv[]) { // ClearDNS service
 //    wait(&status);
 //    return 0;
 
-//    create_folder(WORK_DIR);
+    create_folder(WORK_DIR);
 
     // TODO: load assets first
-//    load_config(config_file);
-//    free(config_file);
+    load_config(config_file);
+    free(config_file);
 
 //    process_list_init();
 //    process_list_append(dnsproxy_load("Domestic", loader.domestic, "domestic.json"));
diff --git a/src/common/json.c b/src/common/json.c
index 56742c2..18c0aa2 100644
--- a/src/common/json.c
+++ b/src/common/json.c
@@ -60,68 +60,83 @@ void json_field_replace(cJSON *entry, const char *key, cJSON *content) {
     }
 }
 
-int json_int_value(char *key, cJSON *json) { // json int or string value -> int
+int json_int_value(char *caption, cJSON *json) { // json int or string value -> int
     if (cJSON_IsNumber(json)) {
         return json->valueint;
     } else if (cJSON_IsString(json)) {
         char *p;
         int int_ret = (int)strtol(json->valuestring, &p, 10);
         if (int_ret == 0 && strcmp(json->valuestring, "0") != 0) { // invalid number in string
-            log_fatal("`%s` not a valid number", key);
+            log_fatal("`%s` not a valid number", caption);
         }
         return int_ret;
     } else {
-        log_fatal("`%s` must be number or string", key);
+        log_fatal("`%s` must be number or string", caption);
     }
     return 0; // never reach
 }
 
-uint8_t json_bool_value(char *key, cJSON *json) { // json bool value -> bool
+uint8_t json_bool_value(char *caption, cJSON *json) { // json bool value -> bool
     if (!cJSON_IsBool(json)) {
-        log_fatal("`%s` must be boolean", key);
+        log_fatal("`%s` must be boolean", caption);
     }
     return json->valueint;
 }
 
-char* json_string_value(char* key, cJSON *json) { // json string value -> string
+char* json_string_value(char* caption, cJSON *json) { // json string value -> string
     if (!cJSON_IsString(json)) {
-        log_fatal("`%s` must be string", key);
+        log_fatal("`%s` must be string", caption);
     }
     return string_init(json->valuestring);
 }
 
-char** json_string_list_value(char *key, cJSON *json, char **string_list) { // json string array -> string list
+char** json_string_list_value(char *caption, cJSON *json, char **string_list) { // json string array
     if (cJSON_IsString(json)) {
         string_list_append(&string_list, json->valuestring);
     } else if (cJSON_IsArray(json)) {
         json = json->child;
         while (json != NULL) {
             if (!cJSON_IsString(json)) {
-                log_fatal("`%s` must be string array", key);
+                log_fatal("`%s` must be string array", caption);
             }
             string_list_append(&string_list, json->valuestring);
             json = json->next; // next key
         }
     } else if (!cJSON_IsNull(json)) { // allow null -> empty string list
-        log_fatal("`%s` must be array or string", key);
+        log_fatal("`%s` must be array or string", caption);
     }
     return string_list;
 }
 
-uint32_t** json_uint32_list_value(char *key, cJSON *json, uint32_t **uint32_list) { // json uint32 array -> uint32 list
+uint32_t** json_uint32_list_value(char *caption, cJSON *json, uint32_t **uint32_list) { // json uint32 array
     if (cJSON_IsNumber(json)) {
         uint32_list_append(&uint32_list, json->valueint);
     } else if (cJSON_IsArray(json)) {
         json = json->child;
         while (json != NULL) {
             if (!cJSON_IsNumber(json)) {
-                log_fatal("`%s` must be number array", key);
+                log_fatal("`%s` must be number array", caption);
             }
             uint32_list_append(&uint32_list, json->valueint);
             json = json->next; // next key
         }
     } else if (!cJSON_IsNull(json)) { // allow null -> empty uint32 list
-        log_fatal("`%s` must be array or number", key);
+        log_fatal("`%s` must be array or number", caption);
     }
     return uint32_list;
 }
+
+void json_string_map_value(char *caption, cJSON *json, char ***key_list, char ***value_list) { // json string map
+    if (!cJSON_IsObject(json)) {
+        log_fatal("`%s` must be map", caption);
+    }
+    json = json->child;
+    while (json != NULL) { // traverse all json field
+        if (!cJSON_IsString(json)) {
+            log_fatal("`%s` must be string-string map", caption);
+        }
+        string_list_append(key_list, json->string);
+        string_list_append(value_list, json->valuestring);
+        json = json->next;
+    }
+}
diff --git a/src/common/structure.c b/src/common/structure.c
index 1251091..4f7f526 100644
--- a/src/common/structure.c
+++ b/src/common/structure.c
@@ -3,7 +3,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include "sundry.h"
-#include "constant.h"
 #include "structure.h"
 
 char** string_list_init() { // init string list
@@ -18,37 +17,17 @@ 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
-//    string_list[len] = string_init(string);
-//    string_list[len + 1] = NULL; // list end sign
-//    return string_list;
-//}
-
 void string_list_append(char ***string_list, const char *string) {
     uint32_t len = string_list_len(*string_list);
     *string_list = (char **)realloc(*string_list, sizeof(char *) * (len + 2)); // extend string list
     (*string_list)[len] = string_init(string);
     (*string_list)[len + 1] = NULL; // list end sign
-//    return string_list;
 }
 
-//char** string_list_update(char **base_list, char **update_list) { // combine two string list
-//    for (char **string = update_list; *string != NULL; ++string) {
-////        base_list = string_list_append(base_list, *string);
-//        string_list_append(&base_list, *string);
-//    }
-//    return base_list;
-//}
-
 void string_list_update(char ***base_list, char **update_list) { // combine two string list
     for (char **string = update_list; *string != NULL; ++string) {
-//        base_list = string_list_append(base_list, *string);
         string_list_append(base_list, *string);
     }
-//    return base_list;
 }
 
 void string_list_free(char **string_list) { // free string list
@@ -90,14 +69,12 @@ void uint32_list_append(uint32_t ***uint32_list, uint32_t number) { // add new u
     (*uint32_list)[len] = (uint32_t *)malloc(sizeof(uint32_t));
     *(*uint32_list)[len] = number;
     (*uint32_list)[len + 1] = NULL; // list end sign
-//    return uint32_list;
 }
 
 void uint32_list_update(uint32_t ***base_list, uint32_t **update_list) { // combine two uint32 list
     for (uint32_t **number = update_list; *number != NULL; ++number) {
         uint32_list_append(base_list, **number);
     }
-//    return base_list;
 }
 
 void uint32_list_free(uint32_t **uint32_list) { // free uint32 list
diff --git a/src/common/sundry.c b/src/common/sundry.c
index 2340e92..1f0edcf 100644
--- a/src/common/sundry.c
+++ b/src/common/sundry.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/time.h>
+#include <unistd.h>
 #include "logger.h"
 #include "constant.h"
 #include "structure.h"
@@ -51,5 +52,6 @@ uint16_t gen_rand_num(uint16_t limit) { // 0 ~ (limit - 1)
     struct timeval tv;
     gettimeofday(&tv, NULL);
     srand(tv.tv_usec);
+    usleep(1); // sleep 1us (different time seed)
     return rand() % limit; // NOLINT
 }
diff --git a/src/loader/config.c b/src/loader/config.c
index 89a452e..653760a 100644
--- a/src/loader/config.c
+++ b/src/loader/config.c
@@ -102,12 +102,15 @@ void config_free(cleardns_config *config) { // free config struct of cleardns
     string_list_free(config->diverter.china_ip);
     string_list_free(config->diverter.chinalist);
 
+    string_list_free(config->assets.update_file);
+    string_list_free(config->assets.update_url);
+
     uint32_list_free(config->reject);
     string_list_free(config->hosts);
     string_list_free(config->ttl);
     string_list_free(config->script);
-
     free(config->adguard.username);
     free(config->adguard.password);
+    free(config->assets.cron);
     free(config);
 }
diff --git a/src/loader/loader.c b/src/loader/loader.c
index 64b5313..0363e7c 100644
--- a/src/loader/loader.c
+++ b/src/loader/loader.c
@@ -113,14 +113,15 @@ adguard* load_filter(cleardns_config *config) {
     return filter;
 }
 
-void load_config(const char *config_file) {
+assets_config* load_assets(cleardns_config *config) {
+    // TODO: load assets
+    return NULL;
+}
+
+void load_config(const char *config_file) { // parser and load cleardns configure
     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)
-    string_list_append(&config->assets.update_file, "geoip.dat");
-    string_list_append(&config->assets.update_url, "https://test.net/geoip.dat");
     config_dump(config);
 
     log_info("Loading configure options");
@@ -135,7 +136,10 @@ void load_config(const char *config_file) {
     log_debug("Diverter options parser success");
     loader.filter = load_filter(config);
     log_debug("Filter options parser success");
+    loader.assets = load_assets(config);
+    log_debug("Assets options parser success");
     loader.script = string_list_init();
     string_list_update(&loader.script, config->script);
+    log_debug("Custom script parser success");
     config_free(config);
 }
diff --git a/src/loader/parser.c b/src/loader/parser.c
index 5e19f7a..69de082 100644
--- a/src/loader/parser.c
+++ b/src/loader/parser.c
@@ -113,7 +113,6 @@ 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");
     }
@@ -123,8 +122,7 @@ void assets_parser(assets_config *config, cJSON *json) { // assets options parse
             config->cron = json_string_value("assets.cron", json);
         }
         if (!strcmp(json->string, "update")) {
-            log_warn("GET UPDATE KEY");
-            // TODO: get string map
+            json_string_map_value("assets.update", json, &config->update_file, &config->update_url);
         }
         json = json->next; // next field
     }