Removing Imported Files
You may find that you'd rather not mix your local music files with the Spotify streaming music. In that case, it's easy enough to remove your local files from Spotify.
All you have to do is open Spotify on your computer and select Local Files in the Collection section of the Spotify navigation pane. Right-click the file you want to remove and select Delete from the pop-up menu; the file will no longer be displayed in the Local Files list, and won't be playable if included in a playlist. (The file itself, however, will not be physically deleted from your computerwhich means you can reimport it at a later time, if you want.)