The optical touch-control system processing track detection includes a light source for emitting a specific light; a sensing array for sampling the specific light reflected by an instruction object in a predetermined period of time for accordingly generating a first and a second sensing image signals; a motion detector for determining the track of the instruction object for outputting a motion vector signal according to the first and the second sensing image signals; and a processor for controlling movement of a target object according to the motion vector signal and the predetermined period of time; wherein the instruction object moves within a first zone of the sensing array.