diff --git a/interface/ri_oper.py b/interface/ri_oper.py
index 5e6065b..a0c49c8 100644
--- a/interface/ri_oper.py
+++ b/interface/ri_oper.py
@@ -37,21 +37,6 @@ class Rate:
     def set(n):
         Rate.value = n
 
-def check_mount_point(dev,dir):
-    '''check mount point be used or not. dev is a device of MountPoint.dict, 
-        dir is a directory of MountPoint.dict'''
-    if dir:
-        keys = ri_data.MountPoint.dict.keys()
-        keys.sort()
-        index = keys.index(dev)
-        if index < 1:
-            return  False
-        else:
-            for k in keys[:index-1]:
-                if ri_data.MountPoint.dict[k].directory == dir:
-                    return True
-    return False
-
 class Operation:
     ''' This is a common base class for all install operations.
     The instances of its derived class should have the following
@@ -152,6 +137,7 @@ class MakeRaidConfigure(Operation):
     """class for make raid configure"""
     def __init__(self,scr):
         Operation.__init__(self,"Generate /etc/mdadm.conf",u"生成raid配置文件","mkraidconf.sh",scr)
+
     def install(self):
         if ri_data.Raid.dict.values():
             return Operation.install(self)
@@ -165,20 +151,21 @@ class MakeRaidConfigure(Operation):
 
 class Mount(Operation):
     """class for mount partition"""
+    dict={}
     def __init__(self,scr):
         Operation.__init__(self, 'Mount partition', u'挂载分区', 'mount_partition.sh',scr)	
 
     def get_stdin(self):
         mount=''
         n = 0
-        M_keys = ri_data.MountPoint.dict.keys()
-        M_keys.sort()
-        for k in M_keys :
-            instance = ri_data.MountPoint.dict[k]
-            if check_mount_point(instance.device, instance.directory): continue
-            if instance.directory != '' and instance.filesystem !='':
-                mount+="/dev/%s %s %s\n"%(instance.device,instance.directory,instance.filesystem)
-                n += 1
+        for dir in set([ m.directory for m in ri_data.MountPoint.dict.values() if m.directory ]):
+            for k in ri_data.MountPoint.dict.keys():
+                if ri_data.MountPoint.dict[k] == dir and ri_data.MountPoint.dict[k].filesystem:
+                    # during configure fstab, use dict of Mount
+                    Mount.dict[k]=dir
+                    mount+='/dev/%s %s %s\n' %(k,dir,ri_data.MountPoint.dict[k].filesystem)
+                    n+=1
+                    break
         self.steps += n
         return mount
 
@@ -206,16 +193,14 @@ class ConfigureFstab(Mount):
     def get_stdin(self):
         fstab=''
         flag=True
-        M_keys = ri_data.MountPoint.dict.keys()
-        M_keys.sort()
-        for k in M_keys:
-            instance = ri_data.MountPoint.dict[k]
-            if check_mount_point(instance.device, instance.directory): continue
-            if instance.filesystem != ''  and instance.directory !='':
-                fstab += "/dev/%s %s %s\n" %(instance.device, instance.directory, instance.filesystem)
-            elif instance.filesystem == 'swap' and flag:
-                fstab += "/dev/%s swap swap\n" %instance.device
-                flag=False
+        for k in Mount.dict.keys():
+            if ri_data.MountPoint.dict[k] != 'swap':
+                fstab += "/dev/%s %s %s\n" %(k,Mount.dict[k],ri_data.MountPoint.dict[k].filesystem)
+
+        for k in ri_data.MountPoint.dict.keys(): 
+            if ri_data.MountPoint.dict[k].filesystem == 'swap':
+                fstab += '/dev/%s swap swap\n' %k
+                break
         return fstab    
 
 class GenerateIssue(Operation):
@@ -294,6 +279,7 @@ class ExecFinishInstall(Operation):
     """class for exec finish install"""
     def __init__(self,scr):
         Operation.__init__(self,"Exec finish_install script",u"安装完成执行的脚本","exec_finish_install.sh",scr)
+
     def get_stdin(self):
         return "99finish_install.sh\n"
 
@@ -320,7 +306,6 @@ class ConfigureBootloader(Operation):
     def get_arguments(self):
         list=[]
         tp="grub"
-        isboot=False
         # FIXME if tag file format is error?
         if os.path.isfile("/tag"):
             fd = open("/tag","r")
@@ -329,19 +314,12 @@ class ConfigureBootloader(Operation):
             fd.close()
 
         bootloader=['-t',tp,'-o',list[0][5:].split('.')[0]+'.'+list[0][5:].split('.')[1]]
-        M_keys = ri_data.MountPoint.dict.keys()
-        M_keys.sort()
-        for k in M_keys:
-            instance = ri_data.MountPoint.dict[k]
-            if check_mount_point(instance.device,instance.directory): continue
-            if instance.directory == '/':
-                bootloader +=['-r',instance.device]
-                isboot=True
-                continue
+        for k in Mount.dict.keys():
+            if '/' == Mount.dict[k]:
+                bootloader += ['-r',k]
+            if '/boot' == Mount.dict[k]:
+                bootloader += ['-b',k]
 
-            if isboot and instance.directory == '/boot':
-                bootloader += ['-b',instance.device]
-            
         if ri_data.SerialNumber.value:
             bootloader+=['-k',"linx_serial=%s" %ri_data.SerialNumber.value]
         return bootloader