The imaging lidar has some advantages such as long detect distance, high frequency, narrow wave, high precision of distance and angle and less influence of illumination. So the imaging lidar is applied more and more in space. The application status of the imaging lidar was firstly introduced in space at home and abroad. Then the key technologies of relative navigation based on imaging lidar for space non-cooperative target were described. Finally, the simulation experiment of the spacecraft simulator was given. The simulation experiment result shows that the precision of relative navigation based on the imaging lidar for non-cooperation target is high. Then this relative navigation method is reasonable and feasible and meets the relative navigation mission requirements. So it could be applied to on-orbit spacecraft maintenance and serving, spatial manipulation of close distance space target, and so on. The research of this method provides the technology reference for the engineering implementation in future.