diff --git a/bsp/jz47xx/SConscript b/bsp/jz47xx/SConscript
index a3ff4c0a51..e4d3dd791a 100644
--- a/bsp/jz47xx/SConscript
+++ b/bsp/jz47xx/SConscript
@@ -1,29 +1,12 @@
-Import('env')
-Import('projects')
+import rtconfig
 Import('RTT_ROOT')
-Import('rtconfig')
-
-# group definitions
-group = {}
-group['name'] = 'Startup'
-group['CCFLAGS'] = ''
-group['CPPPATH'] = [RTT_ROOT + '/bsp/jz47xx']
-group['CPPDEFINES'] = []
-group['LINKFLAGS'] = ''
+from building import *
 
 src_bsp   = ['application.c', 'startup.c', 'board.c']
 src_drv   = ['uart.c']
 
-group['src'] = File(src_bsp + src_drv)
+src	= File(src_bsp + src_drv)
+CPPPATH = Dir('#')
+group = DefineGroup('Startup', src, depend = [''], CPPPATH = CPPPATH)
 
-# add group to project list
-projects.append(group)
-
-env.Append(CCFLAGS = group['CCFLAGS'])
-env.Append(CPPPATH = group['CPPPATH'])
-env.Append(CPPDEFINES = group['CPPDEFINES'])
-env.Append(LINKFLAGS = group['LINKFLAGS'])
-
-obj = env.Object(group['src'])
-
-Return('obj')
+Return('group')
diff --git a/bsp/jz47xx/SConstruct b/bsp/jz47xx/SConstruct
index 21e393cf98..8922b1a466 100644
--- a/bsp/jz47xx/SConstruct
+++ b/bsp/jz47xx/SConstruct
@@ -2,12 +2,15 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
-sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
-import mdk
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
 
-target = 'rtthread-jz47xx'
-projects = []
+sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
+from building import *
+
+TARGET = 'rtthread-jz47xx.' + rtconfig.TARGET_EXT
 
 env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
@@ -16,23 +19,14 @@ env = Environment(tools = ['mingw'],
 	LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
 env.PrependENVPath('PATH', rtconfig.EXEC_PATH)
 
-Export('env')
 Export('RTT_ROOT')
 Export('rtconfig')
-Export('projects')
 
-# kernel building script
-objs = SConscript(RTT_ROOT + '/src/SConscript', variant_dir='build/src', duplicate=0)
-# arch building script
-objs = objs + SConscript(RTT_ROOT + '/libcpu/SConscript', variant_dir='build/libcpu', duplicate=0)
+# prepare building environment
+objs = PrepareBuilding(env, RTT_ROOT)
 
-# component script 
-Repository(RTT_ROOT)
-objs = objs + SConscript('components/SConscript')
-
-# board build script
-objs = objs + SConscript('SConscript', variant_dir='build/bsp', duplicate=0)
-
-TARGET = target + '.' + rtconfig.TARGET_EXT
+# build program 
 env.Program(TARGET, objs)
-env.AddPostAction(TARGET, rtconfig.POST_ACTION)
+
+# end building 
+EndBuilding(TARGET)
diff --git a/bsp/jz47xx/rtconfig.py b/bsp/jz47xx/rtconfig.py
index 53d59e4f2b..ea679a279e 100644
--- a/bsp/jz47xx/rtconfig.py
+++ b/bsp/jz47xx/rtconfig.py
@@ -1,56 +1,6 @@
-import SCons.cpp
-
-# component options
-
-# make all component false
-RT_USING_FINSH 		= False
-RT_USING_DFS 		= False
-RT_USING_DFS_ELMFAT = False
-RT_USING_DFS_YAFFS2	= False
-RT_USING_LWIP 		= False
-RT_USING_WEBSERVER	= False
-RT_USING_RTGUI 		= False
-RT_USING_MODULE		= False
-
-# parse rtconfig.h to get used component
-PreProcessor = SCons.cpp.PreProcessor()
-f = file('rtconfig.h', 'r')
-contents = f.read()
-f.close()
-PreProcessor.process_contents(contents)
-rtconfig_ns = PreProcessor.cpp_namespace
-
-# finsh shell options
-if rtconfig_ns.has_key('RT_USING_FINSH'):
-	RT_USING_FINSH = True
-
-# device virtual filesystem options
-if rtconfig_ns.has_key('RT_USING_DFS'):
-    RT_USING_DFS = True
-
-    if rtconfig_ns.has_key('RT_USING_DFS_ELMFAT'):
-        RT_USING_DFS_ELMFAT = True
-    if rtconfig_ns.has_key('RT_USING_DFS_YAFFS2'):
-        RT_USING_DFS_YAFFS2 = True
-
-# lwip options
-if rtconfig_ns.has_key('RT_USING_LWIP'):
-    RT_USING_LWIP = True
-    if rtconfig_ns.has_key('RT_USING_WEBSERVER'):
-        RT_USING_WEBSERVER = True
-
-# rtgui options
-if rtconfig_ns.has_key('RT_USING_RTGUI'):
-    RT_USING_RTGUI = True
-
-# module options
-if rtconfig_ns.has_key('RT_USING_MODULE'):
-    RT_USING_MODULE = True
-
 # toolchains options
-ARCH='mips'
-CPU='jz47xx'
-
+ARCH     = 'mips'
+CPU      = 'jz47xx'
 CROSS_TOOL  = 'gcc'
 PLATFORM 	= 'gcc'
 EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'