Change-3 (CE-3) is the first lander and rover of China following the success of Change-1 and Change-2 (CE-2) orbiters.High precision topographic mapping can provide detailed terrain information to ensure the safety of the rover as well as to support scientific investigations.In this research,multi-source data are co-registered into a uniform geographic framework for high precision topographic mapping at the CE-3 landing site.CE-2 CCD images with 7 m- and 1.5 m- resolutions are registered using selfcalibration bundle adjustment method with ground control points (GCPs) selected from LRO WAC mosaic map and LOLA DTM.The trajectory of CE-3 descent images are recovered using self-calibration free net bundle adjustment,and then the topographic data is rectified by absolute orientation with GCPs selected from the adjusted CE-2 DEM and DOM.Finally,these topographic data are integrated into the same geographic framework for unified,multi-scale,high precision mapping of the CE-3 landing site.Key technologies and the mapping products of this research have been used to support the surface operations of CE-3 mission.