A tab mechanism adopted for a zipper slide has a connection member having a hanging portion connecting the zipper slide and a clamping portion downwardly extending from the hanging portion. A locking structure having a top end connects the clamping portion of the connection member and a bottom end for hanging an object. The locking structure includes a male buckle and a female buckle clamping on and detachable from the male buckle for easily hanging an identification card, a toy, a whistle, a cell phone, or similar objects to avoid loss and damage.