In order to improve the laser pulse contrast, an optical Kerr shutter was used to select the main pulse to restrain the noise of the main pulse.The laser was split into two beams. One of them was used as a gate light to control the optical Kerr shutter,and the other was to be cleaned. The two beams were spacial crossed in optical Kerr materials. The open time of the optical Kerr shutter was controlled to select the main pulse,while the light outs of the shutter were blocked. Therefore, the laser pulse contrast was enhanced.The experiment result showed that the duration and the transmission ratio of the optical Kerr shutter are about 570 fs and 17%,respectively and the pulse contrast has been enhanced by 104 times. The conclusion is that the optical Kerr shutter technology can efficiently enhance laser pulse contrast.