Abstract: The present invention provides a steel ball bearing sliding mechanism for drawers, particularly to a easy-to-use, well-aligned drawer sliding mechanism. It mainly consists of a sliding rail having a retaining plate movably connected thereto. The slits and the shoulder portion of the retaining plate are provided to interlock with the protruded point and the stair portion of the blocking member connected to the intermediate rail, so as to prevent the drawer from misalignment and disengagement. Moreover, the drawer can be pulled out with ease by pressing the retaining plate. The sliding mechanism according to the present invention delivers a smooth, effortless, and whisper-quiet opening and closing of the drawer.