With a special watch opening tool, if it is a spiral waterproof watch, the upper shell and the back cover of the watch case are threaded, and the upper shell and the back cover are tightened by the function of the threads. The watch glass is pressed in with a tool, which is relatively tight. Waterproof washers are placed at the top of the winding handle and the joint between the back cover and the upper shell, which can play a certain waterproof role.