Mirrored DB on Restoring state after removing Mirroing also We done Mirroring of MS SQL data base to other system without witness on synchronize mode. When I Remove mirroring(not pausing , not fail over) by manually My Mirrored Database still continuing in Restoring state
That is normal. When you setup a database mirroring the mirror database is on no recovery/restoring mode and copies and run transaction executed on primary server. Then when you remove the database mirroring you just stopped those transaction to be transferred and nothing is happened to bring it back to recovery mode. If you want your secondary (mirror) database to be active you have to execute.

      RESTORE DATABASE YourDatabaseName  WITH RECOVERY