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In many space missions such as fly-around observing and approaching the targets, the relative pose estimation of non-cooperative space targets is one of the key technologies. In this paper, A tight coupling method for relative pose estimation of the non-cooperative space targets based on monocular camera and laser rangefinder is proposed. The monocular camera is used to obtain the sequence image of the target. The laser rangefinder is used to solve the scale fuzziness problem of monocular camera and construct the world coordinate system in real scale during initialization. In the continuous pose estimation, the camera data and the laser rangefinder data are fused in a tightly coupled form to optimize the estimated pose. The non-cooperative space target images generated by Blender are used for simulation. The results show that the method proposed in this paper has good real-time performance and can estimate the relative pose of non-cooperative space targets accurately and robustly.