A bracket structure and a method of using the bracket structure are provided. The bracket structure includes a bracket body and a locking plate. The top plate and the rear plate of the bracket body respectively form an upper hook portion and a lower hook portion. The locking plate is movably disposed on the top plate of the bracket body. The locking plate has a locking plate body and a control part, and the locking plate body has a first and a second pressing abutting portion. The upper track is placed between the top plate and the rear plate, so that the bottom of the upper track is placed on the lower hook portion, and the first hook portion of the upper track and the upper hook portion of the bracket body are hooked to each other to temporarily fix the upper track on the bracket structure.