diff --git a/include/common.h b/include/common.h
index 9ba173d..f4882d7 100644
--- a/include/common.h
+++ b/include/common.h
@@ -13,9 +13,14 @@ typedef u_int64_t uint64_t;
 #define TRUE  1
 #define FALSE 0
 
+#define DNS_PORT      53
+#define ADGUARD_PORT  80
+#define DIVERTER_PORT 5353
 #define DOMESTIC_PORT 4053
 #define FOREIGN_PORT  6053
-#define DIVERTER_PORT 5353
+
+#define ADGUARD_USER   "admin"
+#define ADGUARD_PASSWD "adguard"
 
 #define DNSPROXY_BIN "dnsproxy"
 #define OVERTURE_BIN "overture"
@@ -30,8 +35,10 @@ typedef u_int64_t uint64_t;
 
 //void load_start_command(char *adguard_workdir, char *overture_config, char *upstream_config, int is_debug);
 
-char* show_bool(int value);
-char* read_file(char *file);
-void save_file(char *file, char *content);
+char* show_bool(uint8_t value);
+char* read_file(const char *file);
+void save_file(const char *file, const char *content);
+void string_list_debug(char *describe, char **string_list);
+void uint32_list_debug(char *describe, uint32_t **uint32_list);
 
 #endif
diff --git a/include/load.h b/include/load.h
new file mode 100644
index 0000000..0510fbe
--- /dev/null
+++ b/include/load.h
@@ -0,0 +1,50 @@
+#ifndef _LOAD_H_
+#define _LOAD_H_
+
+#include "common.h"
+
+typedef struct {
+    uint16_t port;
+    uint8_t verify; // bool value
+    uint8_t parallel; // bool value
+    char **bootstrap;
+    char **fallback;
+    char **primary;
+} upstream_config;
+
+typedef struct {
+    uint16_t port;
+    char **gfwlist;
+    char **china_ip;
+    char **chinalist;
+} diverter_config;
+
+typedef struct {
+    uint32_t size;
+    uint8_t enable; // bool value
+    uint8_t optimistic; // bool value
+} cache_config;
+
+typedef struct {
+    uint16_t port;
+    uint8_t enable;
+    char *username;
+    char *password;
+} adguard_config;
+
+typedef struct {
+    uint16_t port;
+    cache_config cache;
+    upstream_config domestic;
+    upstream_config foreign;
+    diverter_config diverter;
+    adguard_config adguard;
+    uint32_t **reject;
+    char **hosts;
+    char **ttl;
+} cleardns_config;
+
+void load_config(const char *config_file);
+void json_config_parser(cleardns_config *config, const char *config_file);
+
+#endif
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 458b539..1ac2906 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -3,7 +3,8 @@ cmake_minimum_required(VERSION 2.8.12)
 include_directories(${PROJECT_SOURCE_DIR}/include)
 include_directories(${PROJECT_SOURCE_DIR}/include/utils)
 
+add_subdirectory(load)
 add_subdirectory(utils)
 
 add_executable(cleardns cleardns.c dnsproxy.c common.c overture.c)
-target_link_libraries(cleardns utils)
+target_link_libraries(cleardns load utils)
diff --git a/src/cleardns.c b/src/cleardns.c
index 5a85afb..242fc12 100644
--- a/src/cleardns.c
+++ b/src/cleardns.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include "load.h"
 #include "logger.h"
 #include "common.h"
 #include "dnsproxy.h"
@@ -35,6 +36,7 @@ int main(int argc, char *argv[]) { // ClearDNS server
     LOG_LEVEL = LOG_DEBUG;
     log_info("ClearDNS server start (%s)", VERSION);
 
+    load_config("test.json");
 
 //    char **temp = string_list_init();
 //    temp = string_list_append(temp, "123");
@@ -80,23 +82,23 @@ int main(int argc, char *argv[]) { // ClearDNS server
 //    log_info("cwd -> %s", p->cwd);
 
 
-    overture *diverter = overture_init(DIVERTER_PORT);
-
-    diverter->timeout = 8;
-    diverter->domestic_ip_file = "china-ip.txt";
-    diverter->domestic_domain_file = "chinalist.txt";
-    diverter->foreign_domain_file = "gfwlist.txt";
-
-    diverter->debug = TRUE;
-    diverter->ttl_file = "domain_ttl.txt";
-    diverter->host_file = "hosts.txt";
-    diverter->reject_type = uint32_list_append(diverter->reject_type, 255);
-    diverter->reject_type = uint32_list_append(diverter->reject_type, 254);
-
-    process *p = overture_load(diverter, "overture.json");
-    log_info("cmd -> %s", string_list_dump(p->cmd));
-    log_info("env -> %s", string_list_dump(p->env));
-    log_info("cwd -> %s", p->cwd);
+//    overture *diverter = overture_init(DIVERTER_PORT);
+//
+//    diverter->timeout = 8;
+//    diverter->domestic_ip_file = "china-ip.txt";
+//    diverter->domestic_domain_file = "chinalist.txt";
+//    diverter->foreign_domain_file = "gfwlist.txt";
+//
+//    diverter->debug = TRUE;
+//    diverter->ttl_file = "domain_ttl.txt";
+//    diverter->host_file = "hosts.txt";
+//    diverter->reject_type = uint32_list_append(diverter->reject_type, 255);
+//    diverter->reject_type = uint32_list_append(diverter->reject_type, 254);
+//
+//    process *p = overture_load(diverter, "overture.json");
+//    log_info("cmd -> %s", string_list_dump(p->cmd));
+//    log_info("env -> %s", string_list_dump(p->env));
+//    log_info("cwd -> %s", p->cwd);
 
 
 //    int debug_mode = 0;
diff --git a/src/common.c b/src/common.c
index 5db4bec..5d30b6f 100644
--- a/src/common.c
+++ b/src/common.c
@@ -2,8 +2,9 @@
 #include <stdlib.h>
 #include "common.h"
 #include "logger.h"
+#include "structure.h"
 
-char* show_bool(int value) { // return `true` or `false`
+char* show_bool(uint8_t value) { // return `true` or `false`
     if (value) {
         return "true";
     } else {
@@ -11,7 +12,19 @@ char* show_bool(int value) { // return `true` or `false`
     }
 }
 
-void save_file(char *file, char *content) { // save into file
+void string_list_debug(char *describe, char **string_list) {
+    char *string_ret = string_list_dump(string_list);
+    log_debug("%s -> %s", describe, string_ret);
+    free(string_ret);
+}
+
+void uint32_list_debug(char *describe, uint32_t **uint32_list) {
+    char *string_ret = uint32_list_dump(uint32_list);
+    log_debug("%s -> %s", describe, string_ret);
+    free(string_ret);
+}
+
+void save_file(const char *file, const char *content) { // save into file
     log_debug("Write into `%s` -> \n%s", file, content);
     FILE* fp = fopen(file , "w");
     if (fp == NULL) {
@@ -22,7 +35,7 @@ void save_file(char *file, char *content) { // save into file
     log_debug("Save `%s` success", file);
 }
 
-char* read_file(char *file) { // read file content
+char* read_file(const char *file) { // read file content
     log_debug("Read file -> %s", file);
     FILE *fp = fopen(file, "rb");
     if (fp == NULL) { // file open failed
diff --git a/src/load/CMakeLists.txt b/src/load/CMakeLists.txt
new file mode 100644
index 0000000..fc14767
--- /dev/null
+++ b/src/load/CMakeLists.txt
@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 2.8.12)
+
+add_library(load load.c json.c)
diff --git a/src/load/json.c b/src/load/json.c
new file mode 100644
index 0000000..7095216
--- /dev/null
+++ b/src/load/json.c
@@ -0,0 +1,22 @@
+#include <string.h>
+#include "load.h"
+#include "cJSON.h"
+#include "common.h"
+#include "logger.h"
+
+void json_config_parser(cleardns_config *config, const char *config_file) { // JSON format configure
+    char *config_content = read_file(config_file);
+    cJSON *json = cJSON_Parse(config_content);
+    if (json == NULL) {
+        log_fatal("JSON format error");
+    }
+    json = json->child;
+    while (json != NULL) {
+        if (!strcmp(json->string, "port")) {
+            // get dns port
+        }
+
+        json = json->next; // next field
+    }
+    cJSON_free(json); // free JSON struct
+}
diff --git a/src/load/load.c b/src/load/load.c
new file mode 100644
index 0000000..727a2c5
--- /dev/null
+++ b/src/load/load.c
@@ -0,0 +1,85 @@
+#include "load.h"
+#include "common.h"
+#include "logger.h"
+#include "structure.h"
+
+cleardns_config* config_init() {
+    cleardns_config *config = (cleardns_config *)malloc(sizeof(cleardns_config));
+    config->port = DNS_PORT;
+    config->cache.size = 0;
+    config->cache.enable = FALSE;
+    config->cache.optimistic = FALSE;
+
+    config->domestic.port = DOMESTIC_PORT;
+    config->domestic.verify = TRUE;
+    config->domestic.parallel = TRUE;
+    config->domestic.bootstrap = string_list_init();
+    config->domestic.fallback = string_list_init();
+    config->domestic.primary = string_list_init();
+
+    config->foreign.port = FOREIGN_PORT;
+    config->foreign.verify = TRUE;
+    config->foreign.parallel = TRUE;
+    config->foreign.bootstrap = string_list_init();
+    config->foreign.fallback = string_list_init();
+    config->foreign.primary = string_list_init();
+
+    config->diverter.port = DIVERTER_PORT;
+    config->diverter.gfwlist = string_list_init();
+    config->diverter.china_ip = string_list_init();
+    config->diverter.chinalist = string_list_init();
+
+    config->adguard.port = ADGUARD_PORT;
+    config->adguard.enable = TRUE;
+    config->adguard.username = ADGUARD_USER;
+    config->adguard.password = ADGUARD_PASSWD;
+
+    config->reject = uint32_list_init();
+    config->hosts = string_list_init();
+    config->ttl = string_list_init();
+    return config;
+}
+
+void config_dump(cleardns_config *config) {
+    log_debug("DNS port -> %u", config->port);
+    log_debug("Cache size -> %u", config->cache.size);
+    log_debug("Cache enable -> %s", show_bool(config->cache.enable));
+    log_debug("Cache optimistic -> %s", show_bool(config->cache.optimistic));
+
+    log_debug("Domestic port -> %u", config->domestic.port);
+    log_debug("Domestic verify -> %s", show_bool(config->domestic.verify));
+    log_debug("Domestic parallel -> %s", show_bool(config->domestic.parallel));
+    string_list_debug("Domestic bootstrap", config->domestic.bootstrap);
+    string_list_debug("Domestic fallback", config->domestic.fallback);
+    string_list_debug("Domestic primary", config->domestic.primary);
+
+    log_debug("Foreign port -> %u", config->foreign.port);
+    log_debug("Foreign verify -> %s", show_bool(config->foreign.verify));
+    log_debug("Foreign parallel -> %s", show_bool(config->foreign.parallel));
+    string_list_debug("Foreign bootstrap", config->foreign.bootstrap);
+    string_list_debug("Foreign fallback", config->foreign.fallback);
+    string_list_debug("Foreign primary", config->foreign.primary);
+
+    log_debug("Diverter port -> %u", config->diverter.port);
+    string_list_debug("Diverter gfwlist", config->diverter.gfwlist);
+    string_list_debug("Diverter china-ip", config->diverter.china_ip);
+    string_list_debug("Diverter chinalist", config->diverter.chinalist);
+
+    log_debug("AdGuardHome port -> %u", config->adguard.port);
+    log_debug("AdGuardHome enable -> %s", show_bool(config->adguard.enable));
+    log_debug("AdGuardHome username -> %s", config->adguard.username);
+    log_debug("AdGuardHome password -> %s", config->adguard.password);
+
+    uint32_list_debug("DNS reject type", config->reject);
+    string_list_debug("Domain TTL", config->ttl);
+    string_list_debug("Hosts", config->hosts);
+}
+
+void load_config(const char *config_file) {
+    cleardns_config *config = config_init();
+
+    json_config_parser(config, config_file);
+
+    log_info("Configure load success");
+    config_dump(config);
+}