diff --git a/example/arduino/arduino.ino b/example/arduino/arduino.ino
index dcd5f49..84415ff 100755
--- a/example/arduino/arduino.ino
+++ b/example/arduino/arduino.ino
@@ -7,9 +7,7 @@
  * @FilePath: /xcmd/example/arduino/arduino.ino
  */
 #include <Arduino.h>
-#include "inc/xcmd.h"
-#include "inc/xcmd_default_keys.h"
-#include "inc/xcmd_default_cmds.h"
+#include "xcmd.h"
 #include "test.h"
 
 int cmd_get_char(uint8_t *ch)
diff --git a/example/arduino/inc b/example/arduino/inc
deleted file mode 120000
index 6a14105..0000000
--- a/example/arduino/inc
+++ /dev/null
@@ -1 +0,0 @@
-../../inc/
\ No newline at end of file
diff --git a/example/arduino/readme.txt b/example/arduino/readme.txt
deleted file mode 100644
index 2900118..0000000
--- a/example/arduino/readme.txt
+++ /dev/null
@@ -1 +0,0 @@
-需要把根目录的inc和src拷贝到当前目录才能编译通过
\ No newline at end of file
diff --git a/example/arduino/src b/example/arduino/src
deleted file mode 120000
index a8d2a67..0000000
--- a/example/arduino/src
+++ /dev/null
@@ -1 +0,0 @@
-../../src/
\ No newline at end of file
diff --git a/example/arduino/test.c b/example/arduino/test.c
deleted file mode 100644
index aeab4d5..0000000
--- a/example/arduino/test.c
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
- * @Author: your name
- * @Date: 2021-09-22 22:33:17
- * @LastEditTime: 2021-09-22 23:17:02
- * @LastEditors: Please set LastEditors
- * @Description: In User Settings Edit
- * @FilePath: /xcmd/extensions/test/test.c
- */
-#include "test.h"
-#include <string.h>
-#include <stdlib.h>
-
-#define EXIT_MESSAGE() xcmd_print(g_cmder, "press \"q\" or \"Q\" to exit!\r\n")
-
-#define EXIT_CHECK()                 \
-    do                               \
-        (toupper(GET_CHAR()) == 'Q') \
-        {                            \
-            uint8_t c;               \
-            if (GET_CHAR(&c))        \
-            {                        \
-                switch (c)           \
-                case 'q':            \
-                case 'Q':            \
-                case 0x1B:           \
-                    return;          \
-            }                        \
-        }                            \
-    while (0);
-
-static uint8_t param_check(int need, int argc, char*argv[])
-{
-    uint8_t i,ret = 0;
-    if(need<(argc))
-    {
-        ret = 1;
-    }
-    else
-    {
-        xcmd_print("err need %d but input %d:\r\n", need, argc-1);
-    	xcmd_print("input= ");
-	    for(i=0; i<argc; i++)
-	    {
-	        if(argv[i] != NULL)
-	        {
-	            xcmd_print("%s ", argv[i]);
-	        }
-	    }
-	    xcmd_print("\r\n");
-        ret = 0;
-    }
-    return ret;
-}
-
-static void cmd_echo(int argc, char* argv[])
-{
-    if(param_check(1, argc, argv))
-	{
-    	xcmd_print("%s\r\n", argv[1]);
-	}
-}
-
-static void cmd_example(int argc, char* argv[])
-{
-    uint8_t i;
-    if(param_check(1, argc, argv))
-	{
-		if(strcmp(argv[1], "-s") == 0)
-		{
-			for(i=2; i<argc; i++)
-		    {
-		    	xcmd_print("%s\r\n", argv[i]);
-			}
-		}
-		if(strcmp(argv[1], "-i") == 0)
-		{
-			for(i=2; i<argc; i++)
-		    {
-		    	xcmd_print("%d\r\n", atoi(argv[i]));
-			}
-		}
-		if(strcmp(argv[1], "-f") == 0)
-		{
-			for(i=2; i<argc; i++)
-		    {
-		    	xcmd_print("%f\r\n", atof(argv[i]));
-			}
-		}
-	}
-}
-
-static void cmd_history(int argc, char* argv[])
-{
-    uint16_t len = xcmd_history_len();
-    xcmd_history_reset();
-    do
-    {
-        xcmd_print("%s\r\n", xcmd_history_next());
-    }while(len--);
-}
-
-static int cmd_ctr_a(void* pv)
-{
-    xcmd_print("this is ctr+a\n");
-    return 0;
-}
-
-static xcmd_t cmds[] = 
-{
-    {"echo", cmd_echo, "echo anything", NULL},
-    {"history", cmd_history, "show history list", NULL},
-    {"example", cmd_example, "example [-f|-i|-s] [val]", NULL},
-};
-
-static xcmd_key_t keys[] = 
-{
-    {CTR_A, cmd_ctr_a,  NULL},
-};
-
-void test_cmd_init(void)
-{
-    xcmd_cmd_register(cmds, sizeof(cmds)/sizeof(xcmd_t));
-}
-
-void test_keys_init(void)
-{
-    xcmd_key_register(keys, sizeof(keys)/sizeof(xcmd_key_t));
-}
diff --git a/example/arduino/test.c b/example/arduino/test.c
new file mode 120000
index 0000000..e56ede0
--- /dev/null
+++ b/example/arduino/test.c
@@ -0,0 +1 @@
+../../extensions/test/test.c
\ No newline at end of file
diff --git a/example/arduino/test.h b/example/arduino/test.h
deleted file mode 100644
index 4736aac..0000000
--- a/example/arduino/test.h
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * @Author: your name
- * @Date: 2021-09-22 22:33:24
- * @LastEditTime: 2021-09-22 22:52:45
- * @LastEditors: Please set LastEditors
- * @Description: In User Settings Edit
- * @FilePath: /xcmd/extensions/test/test.h
- */
-
-#ifndef TEST_H
-#define TEST_H
-
-#include "inc/xcmd.h"
-
-#ifdef __cplusplus
-extern   "C" {
-#endif
-
-
-void test_cmd_init(void);
-void test_keys_init(void);
-
-#ifdef __cplusplus
-        }
-#endif
-
-
-#endif /* TEST_H */
diff --git a/example/arduino/test.h b/example/arduino/test.h
new file mode 120000
index 0000000..43808b6
--- /dev/null
+++ b/example/arduino/test.h
@@ -0,0 +1 @@
+../../extensions/test/test.h
\ No newline at end of file
diff --git a/example/arduino/xcmd.c b/example/arduino/xcmd.c
new file mode 120000
index 0000000..617857c
--- /dev/null
+++ b/example/arduino/xcmd.c
@@ -0,0 +1 @@
+../../src/xcmd.c
\ No newline at end of file
diff --git a/example/arduino/xcmd.h b/example/arduino/xcmd.h
new file mode 120000
index 0000000..02e2e49
--- /dev/null
+++ b/example/arduino/xcmd.h
@@ -0,0 +1 @@
+../../inc/xcmd.h
\ No newline at end of file
diff --git a/example/arduino/xcmd_confg.h b/example/arduino/xcmd_confg.h
new file mode 120000
index 0000000..0abcc6b
--- /dev/null
+++ b/example/arduino/xcmd_confg.h
@@ -0,0 +1 @@
+../../inc/xcmd_confg.h
\ No newline at end of file
diff --git a/example/arduino/xcmd_default_cmds.c b/example/arduino/xcmd_default_cmds.c
new file mode 120000
index 0000000..fe722cd
--- /dev/null
+++ b/example/arduino/xcmd_default_cmds.c
@@ -0,0 +1 @@
+../../src/xcmd_default_cmds.c
\ No newline at end of file
diff --git a/example/arduino/xcmd_default_cmds.h b/example/arduino/xcmd_default_cmds.h
new file mode 120000
index 0000000..e240ef6
--- /dev/null
+++ b/example/arduino/xcmd_default_cmds.h
@@ -0,0 +1 @@
+../../inc/xcmd_default_cmds.h
\ No newline at end of file
diff --git a/example/arduino/xcmd_default_keys.c b/example/arduino/xcmd_default_keys.c
new file mode 120000
index 0000000..8c556f2
--- /dev/null
+++ b/example/arduino/xcmd_default_keys.c
@@ -0,0 +1 @@
+../../src/xcmd_default_keys.c
\ No newline at end of file
diff --git a/example/arduino/xcmd_default_keys.h b/example/arduino/xcmd_default_keys.h
new file mode 120000
index 0000000..5947bfc
--- /dev/null
+++ b/example/arduino/xcmd_default_keys.h
@@ -0,0 +1 @@
+../../inc/xcmd_default_keys.h
\ No newline at end of file
diff --git a/example/arduino/xcmd_define.h b/example/arduino/xcmd_define.h
new file mode 120000
index 0000000..816af6e
--- /dev/null
+++ b/example/arduino/xcmd_define.h
@@ -0,0 +1 @@
+../../inc/xcmd_define.h
\ No newline at end of file
diff --git a/example/esp_idf/main/CMakeLists.txt b/example/esp_idf/main/CMakeLists.txt
index 5632834..402d6ef 100755
--- a/example/esp_idf/main/CMakeLists.txt
+++ b/example/esp_idf/main/CMakeLists.txt
@@ -1,8 +1,8 @@
 idf_component_register(SRCS "esp_idf.c"
-                            "../../../extensions/test//src/test.c"
+                            "../../../extensions/test/test.c"
                             "../../../src/xcmd.c"
                             "../../../src/xcmd_default_keys.c"
                             "../../../src/xcmd_default_cmds.c"
                     INCLUDE_DIRS "." 
                             "../../../inc/"
-                            "../../../extensions/test/inc/")
+                            "../../../extensions/test/")
diff --git a/example/esp_idf/main/esp_idf.c b/example/esp_idf/main/esp_idf.c
index 4a1b2fa..b77a499 100755
--- a/example/esp_idf/main/esp_idf.c
+++ b/example/esp_idf/main/esp_idf.c
@@ -10,8 +10,6 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include "xcmd.h"
-#include "xcmd_default_keys.h"
-#include "xcmd_default_cmds.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 #include "test.h"
diff --git a/example/linux/Makefile b/example/linux/Makefile
index ed8c484..acb8f6a 100755
--- a/example/linux/Makefile
+++ b/example/linux/Makefile
@@ -1,10 +1,10 @@
 OBJ += xcmd.o xcmd_default_keys.o xcmd_default_cmds.o linux_main.o test.o
 BIN = xcmder
 VPATH := ../../src \
-		 ../../extensions/test/src
+		 ../../extensions/test
 
 INC += -I../../inc \
-	   -I../../extensions/test/inc
+	   -I../../extensions/test
 
 OBJ_WITH_BUILD_DIR:=$(addprefix build/,$(OBJ))
 
diff --git a/example/linux/linux_main.c b/example/linux/linux_main.c
index e5d4d68..eb83409 100755
--- a/example/linux/linux_main.c
+++ b/example/linux/linux_main.c
@@ -9,13 +9,10 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
-#include "xcmd.h"
-#include "xcmd_default_keys.h"
-#include "xcmd_default_cmds.h"
-#include<errno.h>  
-#include<sys/types.h>  
-#include<sys/socket.h>  
+#include <sys/types.h>  
+#include <sys/socket.h>  
 #include <termio.h>
+#include "xcmd.h"
 #include "test.h"
 
 int getch(void)
diff --git a/example/stm32/MDK/stm32f1xx/Project/test.uvprojx b/example/stm32/MDK/stm32f1xx/Project/test.uvprojx
index e7b39ee..cd1908f 100644
--- a/example/stm32/MDK/stm32f1xx/Project/test.uvprojx
+++ b/example/stm32/MDK/stm32f1xx/Project/test.uvprojx
@@ -338,7 +338,7 @@
               <MiscControls></MiscControls>
               <Define>USE_STDPERIPH_DRIVER,STM32F10X_MD</Define>
               <Undefine></Undefine>
-              <IncludePath>..\Libraries\CMSIS\Device\ST\STM32F10x\Include;..\Libraries\STM32F10x_StdPeriph_Driver\inc;..\Libraries\CMSIS\Include;..\User;..\User\port;..\..\..\..\..\inc;..\lib\inc;..\..\..\..\..\extensions\test\inc</IncludePath>
+              <IncludePath>..\Libraries\CMSIS\Device\ST\STM32F10x\Include;..\Libraries\STM32F10x_StdPeriph_Driver\inc;..\Libraries\CMSIS\Include;..\User;..\User\port;..\..\..\..\..\inc;..\lib\inc;..\..\..\..\..\extensions\test</IncludePath>
             </VariousControls>
           </Cads>
           <Aads>
@@ -581,7 +581,7 @@
             <File>
               <FileName>test.c</FileName>
               <FileType>1</FileType>
-              <FilePath>..\..\..\..\..\extensions\test\src\test.c</FilePath>
+              <FilePath>..\..\..\..\..\extensions\test\test.c</FilePath>
             </File>
           </Files>
         </Group>
diff --git a/example/stm32/MDK/stm32f4xx/Project/test.uvprojx b/example/stm32/MDK/stm32f4xx/Project/test.uvprojx
index fb372d6..a78d340 100644
--- a/example/stm32/MDK/stm32f4xx/Project/test.uvprojx
+++ b/example/stm32/MDK/stm32f4xx/Project/test.uvprojx
@@ -338,7 +338,7 @@
               <MiscControls></MiscControls>
               <Define>STM32F427_437xx,USE_STDPERIPH_DRIVER</Define>
               <Undefine></Undefine>
-              <IncludePath>..\FWLIB\CORE;..\FWLIB\inc;..\System\debug;..\System\delay;..\System\sys;..\System\debug;..\user;..\user\bsp\inc;..\user\bsp;..\..\..\..\..\inc;..\..\..\..\..\extensions\test\inc</IncludePath>
+              <IncludePath>..\FWLIB\CORE;..\FWLIB\inc;..\System\debug;..\System\delay;..\System\sys;..\System\debug;..\user;..\user\bsp\inc;..\user\bsp;..\..\..\..\..\inc;..\..\..\..\..\extensions\test</IncludePath>
             </VariousControls>
           </Cads>
           <Aads>
@@ -670,7 +670,7 @@
             <File>
               <FileName>test.c</FileName>
               <FileType>1</FileType>
-              <FilePath>..\..\..\..\..\extensions\test\src\test.c</FilePath>
+              <FilePath>..\..\..\..\..\extensions\test\test.c</FilePath>
             </File>
           </Files>
         </Group>
diff --git a/extensions/test/src/test.c b/extensions/test/test.c
similarity index 99%
rename from extensions/test/src/test.c
rename to extensions/test/test.c
index 86cad59..ff37e49 100644
--- a/extensions/test/src/test.c
+++ b/extensions/test/test.c
@@ -6,9 +6,10 @@
  * @Description: In User Settings Edit
  * @FilePath: /xcmd/extensions/test/test.c
  */
-#include "test.h"
 #include <string.h>
 #include <stdlib.h>
+#include "xcmd.h"
+#include "test.h"
 
 #define EXIT_MESSAGE() xcmd_print(g_cmder, "press \"q\" or \"Q\" to exit!\r\n")
 
diff --git a/extensions/test/inc/test.h b/extensions/test/test.h
similarity index 95%
rename from extensions/test/inc/test.h
rename to extensions/test/test.h
index 1f97066..eed2eb2 100644
--- a/extensions/test/inc/test.h
+++ b/extensions/test/test.h
@@ -10,8 +10,6 @@
 #ifndef TEST_H
 #define TEST_H
 
-#include "xcmd.h"
-
 #ifdef __cplusplus
 extern   "C" {
 #endif
diff --git a/inc/xcmd_confg.h b/inc/xcmd_confg.h
index 29b02b5..fb83e61 100755
--- a/inc/xcmd_confg.h
+++ b/inc/xcmd_confg.h
@@ -15,10 +15,21 @@ extern   "C" {
 
 #define VERSION "1.0.0"
 
-#define XCMD_LINE_MAX_LENGTH    (256) /* 命令行支持的最大字符数 */
+#ifndef XCMD_LINE_MAX_LENGTH
+#define XCMD_LINE_MAX_LENGTH    (64) /* 命令行支持的最大字符数 */
+#endif
+
+#ifndef XCMD_PRINT_BUF_MAX_LENGTH
 #define XCMD_PRINT_BUF_MAX_LENGTH   (128) /* xcmd_print缓存 */
+#endif  
+
+#ifndef  XCMD_HISTORY_MAX_NUM
 #define XCMD_HISTORY_MAX_NUM    (8)  /* 支持的历史记录个数，0为不支持 */
-#define XCMD_PARAM_MAX_NUM      (16)  /* 支持输入的参数个数 */
+#endif
+
+#ifndef XCMD_PARAM_MAX_NUM
+#define XCMD_PARAM_MAX_NUM      (8)  /* 支持输入的参数个数 */
+#endif
 
 #if XCMD_PRINT_BUF_MAX_LENGTH <  (XCMD_LINE_MAX_LENGTH+32)
 #undef XCMD_PRINT_BUF_MAX_LENGTH
diff --git a/src/xcmd.c b/src/xcmd.c
index ca28abb..63a19c1 100755
--- a/src/xcmd.c
+++ b/src/xcmd.c
@@ -1,7 +1,7 @@
-#include "../inc/xcmd.h"
-#include "../inc/xcmd_confg.h"
-#include "../inc/xcmd_default_cmds.h"
-#include "../inc/xcmd_default_keys.h"
+#include "xcmd_confg.h"
+#include "xcmd.h"
+#include "xcmd_default_cmds.h"
+#include "xcmd_default_keys.h"
 #include <stdlib.h>
 #include <stdio.h>
 
diff --git a/src/xcmd_default_cmds.c b/src/xcmd_default_cmds.c
index 3473174..beab2b6 100755
--- a/src/xcmd_default_cmds.c
+++ b/src/xcmd_default_cmds.c
@@ -6,9 +6,9 @@
  * @Description: In User Settings Edit
  * @FilePath: /xcmd/src/xcmd_default_cmds.c
  */
-#include "../inc/xcmd_default_cmds.h"
-#include "../inc/xcmd.h"
-#include "../inc/xcmd_confg.h"
+#include "xcmd_confg.h"
+#include "xcmd_default_cmds.h"
+#include "xcmd.h"
 #include <stdlib.h>
 
 static void cmd_clear(int argc, char* argv[])
diff --git a/src/xcmd_default_keys.c b/src/xcmd_default_keys.c
index d3ed491..1ac4fa4 100755
--- a/src/xcmd_default_keys.c
+++ b/src/xcmd_default_keys.c
@@ -6,9 +6,9 @@
  * @Description: In User Settings Edit
  * @FilePath: /xcmd/src/xcmd_default_keys.c
  */
-#include "../inc/xcmd_default_keys.h"
-#include "../inc/xcmd_confg.h"
-#include "../inc/xcmd.h"
+#include "xcmd_confg.h"
+#include "xcmd.h"
+#include "xcmd_default_keys.h"
 
 static int xcmd_del_char(void *pv)
 {