Abstract: The filling pattern is multi-bunch in Hefei Light Source (HLS). The optical shutter can pick single bunch from multi-bunch for streak camera system to measure, and thus largely reduces the power of input light and protects the vulnerable photocathode of streak camera effectively. The principle of the optical shutter system is presented, and a system is designed according to the wavelength and repetition frequency of light pulse, and the dimension and length of bunches in HLS. The characteristics of electro-optic modulator (EOM), high voltage driver and high speed synchronous divider are presented. The alignment and debugging of the system are introduced, and the measurements using oscilloscope and streak camera are presented.