The mop has a handle, a holding assembly and a head assembly. The holding assembly is mounted on the handle and has a sleeve mounted rotatably around the handle. The head assembly is mounted pivotally on the handle and has fiber strips. A user can hold the sleeve when the mop is wrung by a dehydration device. The sleeve will not be driven by the fiber strips or the handle. Therefore, the mop is stably and safely held and the mop can be more efficient to use.