A control circuit and a method for charge sharing are provided. The control circuit and method are applied to a flat panel display including a plurality of pixel units. The control circuit includes a power supply unit, a data driver, a first switch set, a second switch set, a second switch set, and a timing controller. The control method includes steps of: outputting a first control signal to optionally switch on the switches in the first switch set in a first duration to re-allocate charges stored in the plurality of pixel units; and outputting a second control signal to optionally switch on the switches in the second switch set in a second duration to discharge charges stored in the plurality of pixel units via the voltage output pin.