A scan driver and a driving method of scan driver are provided. The scan driver includes a first shift register and a second shift register respectively receiving a first clock signal and a second clock signal, a first initial pulse signal and a second initial pulse signal and according to a first scanning type or a second scanning type scans scan lines; a selection unit receiving selection signals to select the first shift register or the second shift register for scanning scan lines; a logic control unit receiving an output enable sign controls the outputting; a level shift unit outputting a level signal; an output amplifier amplifying the level signal and outputting to the scan lines. Therefore, it achieves to satisfy requirement of progressive scanning and non-sequential scanning.