diff --git a/install/fs_manager.py b/install/fs_manager.py
index 8583f86..884d8b7 100644
--- a/install/fs_manager.py
+++ b/install/fs_manager.py
@@ -59,6 +59,7 @@ class FileSystemManager:
                       'msdos': '83',
                       'type':['hdd','usb-hdd']},
          'btrfs': {'defaultopt': defaultOpt,
+                   'format':'/sbin/mkfs.btrfs',
                    'formatparam': '{labelparam} {device}',
                    'gpt': '0700',
                    'label': '-L {labelname}',
diff --git a/install/variables/system.py b/install/variables/system.py
index 3bcc35e..04d6455 100644
--- a/install/variables/system.py
+++ b/install/variables/system.py
@@ -106,11 +106,16 @@ class VariableOsFormatUse(ReadonlyVariable):
                 'type': "bool",
                 'value': "off"}
 
+    def checkFunc(self,fs):
+        if fs == "btrfs" and self.Get('os_root_type') == 'livecd':
+            return "no"
+        if "format" in FileSystemManager.supportFS[fs] and \
+               path.exists(FileSystemManager.supportFS[fs]["format"]):
+            return "yes"
+        return "no"
+
     def get(self):
-        return map(lambda x:"yes" 
-            if "format" in FileSystemManager.supportFS[x] and \
-               path.exists(FileSystemManager.supportFS[x]["format"])
-            else "no", self.Get('os_format_type'))
+        return map(self.checkFunc, self.Get('os_format_type'))
 
 class VariableClMigrateRootPwd(UserHelper,Variable):
     """