diff --git a/APP_Framework/Applications/knowing_app/face_detect/Kconfig b/APP_Framework/Applications/knowing_app/face_detect/Kconfig
index 92738ada5..7d3b84e89 100644
--- a/APP_Framework/Applications/knowing_app/face_detect/Kconfig
+++ b/APP_Framework/Applications/knowing_app/face_detect/Kconfig
@@ -4,4 +4,5 @@ config FACE_DETECT
 	depends on DRV_USING_OV2640
 	depends on USING_KPU_POSTPROCESSING
 	depends on USING_YOLOV2
+    select LIB_USING_CJSON
     default n
diff --git a/APP_Framework/Applications/knowing_app/face_detect/face_detect.c b/APP_Framework/Applications/knowing_app/face_detect/face_detect.c
index 702b43c61..3ce3319a5 100644
--- a/APP_Framework/Applications/knowing_app/face_detect/face_detect.c
+++ b/APP_Framework/Applications/knowing_app/face_detect/face_detect.c
@@ -1,6 +1,7 @@
 #include <transform.h>
-
-#include "cJSON.h"
+#ifdef LIB_USING_CJSON
+#include <cJSON.h>
+#endif
 #include "region_layer.h"
 #define ANCHOR_NUM 5
 #define STACK_SIZE (128 * 1024)
diff --git a/APP_Framework/lib/Kconfig b/APP_Framework/lib/Kconfig
index bec09361c..d5064ee30 100755
--- a/APP_Framework/lib/Kconfig
+++ b/APP_Framework/lib/Kconfig
@@ -1,5 +1,5 @@
-menu "app lib"
-
+menu "lib"
+   
     choice
             prompt "chose a kind of lib for app"
             default APP_SELECT_NEWLIB
@@ -10,5 +10,5 @@ menu "app lib"
             config APP_SELECT_OTHER_LIB
                 bool "app select other lib"
     endchoice
-
+     source "$APP_DIR/lib/cJSON/Kconfig"
 endmenu
diff --git a/APP_Framework/lib/SConscript b/APP_Framework/lib/SConscript
new file mode 100644
index 000000000..f307e3f70
--- /dev/null
+++ b/APP_Framework/lib/SConscript
@@ -0,0 +1,14 @@
+import os
+Import('RTT_ROOT')
+from building import *
+
+cwd = GetCurrentDir()
+objs = []
+list = os.listdir(cwd)
+
+for d in list:
+    path = os.path.join(cwd, d)
+    if os.path.isfile(os.path.join(path, 'SConscript')):
+        objs = objs + SConscript(os.path.join(path, 'SConscript'))
+
+Return('objs')
diff --git a/APP_Framework/lib/cJSON/Kconfig b/APP_Framework/lib/cJSON/Kconfig
new file mode 100644
index 000000000..79a2d5892
--- /dev/null
+++ b/APP_Framework/lib/cJSON/Kconfig
@@ -0,0 +1,3 @@
+menuconfig LIB_USING_CJSON
+    bool "USING cJSON"
+    default n
diff --git a/APP_Framework/lib/cJSON/SConscript b/APP_Framework/lib/cJSON/SConscript
new file mode 100644
index 000000000..42322db28
--- /dev/null
+++ b/APP_Framework/lib/cJSON/SConscript
@@ -0,0 +1,10 @@
+from building import * 
+import os
+
+cwd = GetCurrentDir()
+
+src = Glob('*.c')
+
+group = DefineGroup('cjson', src, depend = ['LIB_USING_CJSON'], CPPPATH = [cwd])
+
+Return('group')
\ No newline at end of file
diff --git a/APP_Framework/Applications/knowing_app/face_detect/cJSON.c b/APP_Framework/lib/cJSON/cJSON.c
similarity index 100%
rename from APP_Framework/Applications/knowing_app/face_detect/cJSON.c
rename to APP_Framework/lib/cJSON/cJSON.c
diff --git a/APP_Framework/Applications/knowing_app/face_detect/cJSON.h b/APP_Framework/lib/cJSON/cJSON.h
similarity index 100%
rename from APP_Framework/Applications/knowing_app/face_detect/cJSON.h
rename to APP_Framework/lib/cJSON/cJSON.h
diff --git a/Ubiquitous/RT_Thread/bsp/k210/SConstruct b/Ubiquitous/RT_Thread/bsp/k210/SConstruct
index 55247bc1d..8aad441d4 100644
--- a/Ubiquitous/RT_Thread/bsp/k210/SConstruct
+++ b/Ubiquitous/RT_Thread/bsp/k210/SConstruct
@@ -59,6 +59,7 @@ objs.extend(SConscript(os.getcwd() + '/../../../../APP_Framework/Framework/SCons
 # include APP_Framework/Applications
 objs.extend(SConscript(os.getcwd() + '/../../../../APP_Framework/Applications/SConscript'))
 
-
+# include APP_Framework/lib
+objs.extend(SConscript(os.getcwd() + '/../../../../APP_Framework/lib/SConscript'))
 # make a building
 DoBuilding(TARGET, objs)
diff --git a/Ubiquitous/RT_Thread/bsp/stm32f407-atk-coreboard/SConstruct b/Ubiquitous/RT_Thread/bsp/stm32f407-atk-coreboard/SConstruct
index 6e447c6c1..2bc33db05 100644
--- a/Ubiquitous/RT_Thread/bsp/stm32f407-atk-coreboard/SConstruct
+++ b/Ubiquitous/RT_Thread/bsp/stm32f407-atk-coreboard/SConstruct
@@ -81,6 +81,7 @@ objs.extend(SConscript(os.getcwd() + '/../../../../APP_Framework/Framework/SCons
 
 # include APP_Framework/Applications
 objs.extend(SConscript(os.getcwd() + '/../../../../APP_Framework/Applications/SConscript'))
-
+# include APP_Framework/lib
+objs.extend(SConscript(os.getcwd() + '/../../../../APP_Framework/lib/SConscript'))
 # make a building
 DoBuilding(TARGET, objs)