Method for locating focus point on reflecting layer of optical disc

The present invention discloses a focus control method for locating a focus point on the reflecting layer of an optical disc, particularly a blank disc without data therein. Under a primary focus condition that the focus point is close to the reflecting layer, N offset voltages are sequentially superposed onto a focus error signal to result in N corresponding counting values of a wobble signal. Select a specific offset voltage that results in the greatest counting value of the wobble signal and superpose the specific offset voltage onto the focus error signal and following focus error signals for further focus control.