diff --git a/interface/ri_dep.py b/interface/ri_dep.py
index 828f9c0..a36dff9 100644
--- a/interface/ri_dep.py
+++ b/interface/ri_dep.py
@@ -41,7 +41,7 @@ def construct_depending():
     xml_dict = {}
     for n in xml_root.childNodes:
         if n.nodeType == n.ELEMENT_NODE and n.nodeName == 'package':
-            xml_dict[n.attributes['name'].value] = n
+            xml_dict[n.attributes['name'].value] = n 
             Depending(n.attributes['name'].value)
 
     for d in Depending.dict.values():
@@ -61,7 +61,7 @@ def construct_depended():
                 Depended(dep)
             Depended.dict[dep].depended_by.add(d.name)
 
-def get_extra_depending():
+def get_extra_depending(pkg_list = []):
     l = []
     for g in ri_data.Group.dict.values():
         if g.install != 'no':
@@ -71,6 +71,8 @@ def get_extra_depending():
             else:
                 l.extend([ p[0] for p in g.optional ])
 
+    l = l + pkg_list
+
     set1 = set(l)
     set2 = set(set1)
 
diff --git a/interface/ri_func_dep.py b/interface/ri_func_dep.py
new file mode 100644
index 0000000..8f7b9a5
--- /dev/null
+++ b/interface/ri_func_dep.py
@@ -0,0 +1,100 @@
+#!/usr/bin/env python
+
+import ri_data
+
+class Pkg():
+	pkg_list = []
+
+	@staticmethod
+	def set_pkg_list ():
+		for i in ri_data.Group.dict.values():
+			if i.install != 'no':
+				Pkg.pkg_list += i.mandatory
+				if i.selection == 'all':
+					Pkg.pkg_list += [ j[0] for j in i.optional ]
+				else:
+					Pkg.pkg_list += [ j[0] for j in i.optional if j[1] == 'yes' ]
+
+class FsType():
+	mp_fstype_list = []
+
+	@staticmethod
+	def set_mp_fstype_list ():
+		for fs in ri_data.MountPoint.list:
+			FsType.mp_fstype_list.append(fs.filesystem)
+
+class FunctionDepending:
+	list = []
+	def __init__(self, pkg):
+		self.package = pkg
+		FunctionDepending.list.append(self)
+	
+	def check(self):
+		return False
+
+	def error(self):
+		return {}
+
+
+class FileSystem(FunctionDepending):
+	mp_fstype_list = []
+	def __init__(self, fs_type, fs_pkg):
+		self.filesystem_type = fs_type
+		FunctionDepending.__init__(self, fs_pkg)
+
+	def check(self):
+		if self.filesystem_type in FsType.mp_fstype_list and self.package not in Pkg.pkg_list:
+			return False
+		return True
+	
+	def error(self):
+		mesg="format filesystem " + self.filesystem_type
+		return {mesg:self.package}
+
+class DHCP(FunctionDepending):
+	def __init__(self):
+		FunctionDepending.__init__(self, 'dhcpcd')
+
+	def check(self):
+		if ri_data.Network.configuration == 'dynamic' and 'dhcpcd' not in Pkg.pkg_list:
+			return False
+		return True
+
+	def error(self):
+		return {"dynamic configure network":"dhcpcd"}
+
+class RAID(FunctionDepending):
+	def __init__(self):
+		FunctionDepending.__init__(self, 'mdadm')
+			
+	def check(self):
+		if 'mdadm' not in Pkg.pkg_list:
+			for i in ri_data.Raid.list:
+				if i.from_os == 'no':
+					return False
+		return True
+
+	def error(self):
+		return {"make raid":"mdadm"}
+
+def check_function_depending():
+
+	Pkg.set_pkg_list()
+	FsType.set_mp_fstype_list()
+	func_dep_dict = {}
+
+	FileSystem("xfs", "xfsprogs")
+	FileSystem("jfs", "jfsutils")
+
+	DHCP()
+	RAID()
+
+	for i in FunctionDepending.list:
+		# if function depending package not in package list
+		if not i.check():
+			tmp = i.error()
+			func_dep_dict.update(tmp)
+	return func_dep_dict
+
+#check_function_depending()
+
diff --git a/interface/ri_tk_cmd.py b/interface/ri_tk_cmd.py
index 40aae63..33a28d3 100644
--- a/interface/ri_tk_cmd.py
+++ b/interface/ri_tk_cmd.py
@@ -4,6 +4,7 @@ import ri_tk as display
 import ri_widget
 import ri_data
 import ri_dep
+import ri_func_dep
 
 import re
 import copy
@@ -193,13 +194,25 @@ def software_group_optional_quit():
 
 def dependency_list_init(w=''):
     ''' init function for list in dependency step '''
+    func_dep_list = []
+    f_dep_text = ["function dependency list"]
+    func_dep_dict = ri_func_dep.check_function_depending()
+    for key in func_dep_dict.keys():
+       func_dep_list.append(func_dep_dict[key])
+    f = [ k.ljust(30) + ': ' + func_dep_dict[k] for k in func_dep_dict.keys() ]
+
+    dep_text = ["package dependency list"]
     ri_dep.construct_depending()
     ri_dep.resolve_recursive_depending()
     ri_dep.construct_depended()
-    dep_dict = ri_dep.get_extra_depending()
+
+    dep_dict = ri_dep.get_extra_depending(func_dep_list)
     l = [ k.ljust(20) + ': ' + ' '.join(dep_dict[k]) for k in dep_dict.keys()]
+
+    l = f_dep_text + f + dep_text + l
     display.var_dict['dependency.list'].set(value=tuple(l))
 
+
 def service_construct(w=''):
     ''' construct service widget based on actual data
 w - Widget instance '''