plz try with this
Export and import a subsite, list, or library:
stsadm -o export –url [url of subsite, list, library] –filename D:\spbackup\backup.bak -quiet -overwrite
stsadm -o import –url [url of subsite, list, library] –filename D:\spbackup\backup.bak -quiet
If the command is entered correctly and you have the permission needed to run the export, you should see the Operation Completed Successfully message when the export completes.
Move the newly created backup file to the destination server. To import the file to create new site enter the stsadm import command as shown in the example.
Hope it helps