Abstract: A control device for controlling opening and closing of a window comprises: a motor, a gear reduction mechanism and a supporting member with a rack. The motor and the gear reduction mechanism are fixed on the window. The rack and the supporting member are mounted to the window by mounting members. The motor serves to drive the gear reduction mechanism, and then the gear wheel of the gear reduction mechanism drives the rack and the supporting member to move, and consequently moves the window, thus providing a function of automatically opening and closing the window.