Hi atefeh seify,
Using Windows Easy Transfer to transfer files from Windows7 ,Windows 8,WindowsRT to Windows 8.1 is available. However ,the setting is no longer supported by Windows 8.1 .Because many settings roam automatically and SkyDrive provides an easy way to store and share data, the Windows Easy Transfer has been depreciated.
If you want to transfer both files and settings ,I recommend you to work with User State Migration Tool.It is included in the Windows Assessment and Deployment Kit.
Getting Started with the User State Migration Tool (USMT)
http://technet.microsoft.com/en-us/library/hh824928.aspx
Windows Assessment and Deployment Kit (Windows ADK) for Windows 8.1 Update
http://www.microsoft.com/en-hk/download/details.aspx?id=39982
Best regards