diff --git a/include/common.h b/include/common.h
index 4363295..1ce090a 100644
--- a/include/common.h
+++ b/include/common.h
@@ -4,6 +4,7 @@
 #define RANDOM_PORT_START 41952
 #define RANDOM_PORT_END   65535
 
+extern int is_udp_proxy;
 extern char *server_addr, *client_addr;
 extern char *server_port, *client_port;
 extern char *password;
diff --git a/include/process.h b/include/process.h
index e6cf7fb..94ff6c5 100644
--- a/include/process.h
+++ b/include/process.h
@@ -9,6 +9,6 @@ extern char *SS_LOCAL_HOST;
 extern char *SS_LOCAL_PORT;
 extern char *SS_PLUGIN_OPTIONS;
 
-void start_bootstrap(char *ss_type);
+void start_bootstrap(char *ss_type, int is_udp_proxy);
 
 #endif
diff --git a/src/common.c b/src/common.c
index 8a6ff18..42a762e 100644
--- a/src/common.c
+++ b/src/common.c
@@ -6,6 +6,7 @@
 #include "network.h"
 #include "process.h"
 
+int is_udp_proxy;
 char *server_addr, *client_addr;
 char *server_port, *client_port;
 char *password;
@@ -73,6 +74,7 @@ void params_load(char *ss_default) { // load shadowsocks and plugin params
 }
 
 void args_init() { // init arguments
+    is_udp_proxy = 1; // udp proxy in default
     server_addr = client_addr = NULL;
     server_port = client_port = NULL;
     password = NULL;
@@ -183,7 +185,16 @@ void json_decode(char *json_content) { // decode JSON content
     }
     json = json->child;
     while (json != NULL) {
-        if (!strcmp(json->string, "server")) { // server => server_addr
+        if (!strcmp(json->string, "no_udp")) { // no_udp => without udp proxy
+            if (!cJSON_IsBool(json)) {
+                error_exit("`no_udp` must be a bool.\n");
+            }
+            if (json->valueint) { // is_udp_proxy = ~(json->valueint)
+                is_udp_proxy = 0;
+            } else {
+                is_udp_proxy = 1;
+            }
+        } else if (!strcmp(json->string, "server")) { // server => server_addr
             if (!cJSON_IsString(json)) {
                 error_exit("`server` must be a string.\n");
             }
@@ -301,6 +312,8 @@ void args_decode(int argc, char **argv) { // decode the input parameters
     for (i = 1; i < argc; ++i) {
         if (!strcmp(argv[i], "--debug")) { // --debug => dump args
             debug_flag = 1;
+        } else if (!strcmp(argv[i], "--no-udp")) { // --no-udp => without udp proxy
+            is_udp_proxy = 0;
         } else if (!strcmp(argv[i], "-c")) { // -c => CONFIG_JSON
             if (i + 1 == argc) {
                 error_exit("`-c` require a parameter");
@@ -408,6 +421,11 @@ void args_decode(int argc, char **argv) { // decode the input parameters
 }
 
 void args_dump() { // show parameter's content
+    if (is_udp_proxy) {
+        printf("is_udp_proxy = true\n");
+    } else {
+        printf("is_udp_proxy = false\n");
+    }
     printf("server_addr = %s\n", server_addr);
     printf("client_addr = %s\n", client_addr);
     printf("server_port = %s\n", server_port);
diff --git a/src/local.c b/src/local.c
index 6e309a7..cbe9e66 100644
--- a/src/local.c
+++ b/src/local.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include "common.h"
 #include "process.h"
@@ -25,20 +26,28 @@ ss-bootstrap-local\n\
     --plugin <name>            Enable SIP003 plugin.\n\
     --plugin-opts <options>    Set SIP003 plugin options.\n\
     --shadowsocks <sslocal>    Set shadowsocks local program.\n\
+    --no-udp                   Do not use UDP proxy.\n\
     -h, --help                 Print this message.\n\
 \n\
 ";
 
+void show_help() { // show help message
+    printf("%s", help_msg);
+    exit(0); // exit normally
+}
+
 int main(int argc, char *argv[]) {
     int i;
+    if (argc <= 1) {
+        show_help();
+    }
     for (i = 0; i < argc; ++i) {
         if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
-            printf("%s", help_msg); // show help message
-            return 0;
+            show_help();
         }
     }
     args_decode(argc, argv);
     params_load(SHADOWSOCKS_DEFAULT); // default file name
-    start_bootstrap(SHADOWSOCKS_DEFAULT); // local or server mode
+    start_bootstrap(SHADOWSOCKS_DEFAULT, is_udp_proxy); // local or server mode
     return 0;
 }
diff --git a/src/process.c b/src/process.c
index 8c067cc..34e924c 100644
--- a/src/process.c
+++ b/src/process.c
@@ -182,10 +182,10 @@ void show_params() { // show shadowsocks and plugin params
     }
     printf("\n");
     if (plugin_file == NULL) {
-        printf("[Shadowsocks Bootstrap] plugin no need.\n");
+        printf("[Shadowsocks Bootstrap] Plugin no need.\n");
         return;
     }
-    printf("[Shadowsocks Bootstrap] plugin -> %s\n", plugin_file);
+    printf("[Shadowsocks Bootstrap] Plugin -> %s\n", plugin_file);
     printf("[Shadowsocks Bootstrap]   SS_REMOTE_HOST -> %s\n", SS_REMOTE_HOST);
     printf("[Shadowsocks Bootstrap]   SS_REMOTE_PORT -> %s\n", SS_REMOTE_PORT);
     printf("[Shadowsocks Bootstrap]   SS_LOCAL_HOST -> %s\n", SS_LOCAL_HOST);
@@ -193,15 +193,14 @@ void show_params() { // show shadowsocks and plugin params
     printf("[Shadowsocks Bootstrap]   SS_PLUGIN_OPTIONS -> %s\n", SS_PLUGIN_OPTIONS);
 }
 
-void start_bootstrap(char *ss_type) { // start shadowsocks and plugin (optional)
+void start_bootstrap(char *ss_type, int is_udp_proxy) { // start shadowsocks and plugin (optional)
     show_params();
     main_loop = g_main_loop_new(NULL, FALSE);
     signal(SIGINT, exit_with_child); // catch Ctrl + C (2)
     signal(SIGTERM, exit_with_child); // catch exit signal (15)
     signal(SIGCHLD, get_sub_exit); // callback when child process die
     process_exec(); // exec child process
-    usleep(500 * 1000); // wait 500ms for plugin start
-    if (plugin_file != NULL) { // start udp proxy when using plugin
+    if (plugin_file != NULL && is_udp_proxy) { // start udp proxy when using plugin
         char *remote_ip;
         if (is_ip_addr(SS_REMOTE_HOST)) { // remote_host -> ip address
             remote_ip = SS_REMOTE_HOST;
@@ -223,6 +222,8 @@ void start_bootstrap(char *ss_type) { // start shadowsocks and plugin (optional)
                 proxy(SS_LOCAL_HOST, atoi(SS_LOCAL_PORT), remote_ip, atoi(SS_REMOTE_PORT));
             }
         }
+    } else {
+        printf("[Shadowsocks Bootstrap] UDP Proxy no need.\n");
     }
     g_main_loop_run(main_loop); // into main loop for wait
     exit_with_child();
diff --git a/src/server.c b/src/server.c
index 35ea722..ad2d959 100644
--- a/src/server.c
+++ b/src/server.c
@@ -1,10 +1,9 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include "common.h"
 #include "process.h"
 
-#include "network.h"
-
 #define SHADOWSOCKS_DEFAULT "ssserver"
 
 char *help_msg =
@@ -27,20 +26,28 @@ ss-bootstrap-server\n\
     --plugin <name>            Enable SIP003 plugin.\n\
     --plugin-opts <options>    Set SIP003 plugin options.\n\
     --shadowsocks <ssservre>   Set shadowsocks server program.\n\
+    --no-udp                   Do not use UDP proxy.\n\
     -h, --help                 Print this message.\n\
 \n\
 ";
 
+void show_help() { // show help message
+    printf("%s", help_msg);
+    exit(0); // exit normally
+}
+
 int main(int argc, char *argv[]) {
     int i;
+    if (argc <= 1) {
+        show_help();
+    }
     for (i = 0; i < argc; ++i) {
         if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
-            printf("%s", help_msg); // show help message
-            return 0;
+            show_help();
         }
     }
     args_decode(argc, argv);
     params_load(SHADOWSOCKS_DEFAULT); // default file name
-    start_bootstrap(SHADOWSOCKS_DEFAULT); // local or server mode
+    start_bootstrap(SHADOWSOCKS_DEFAULT, is_udp_proxy); // local or server mode
     return 0;
 }