Positiong method for controlling cursor on screen by using touch device

The invention discloses a position method for controlling a cursor on a screen by using a touch device, which solves the problem that the coordinate of a conventional object on the touch device is unable to be directly displayed on the screen. The method includes: changing the display coordinate of the cursor representing the object on the screen according to a relative coordinate of the object moved on the touch device; when the time of object departing from the touch device exceeds a preset time, the cursor is hidden on the screen; and calculating an initial coordinate of the cursor on the screen when the cursor is hidden on the screen before the object touches the touch device according to an absolute coordinate of the object on the touch device and a ratio of the touch device to a screen resolution factor.