“Yuanzi-3 03 satellite is a high-resolution stereo mapping satellite in China, which plays an important role in global mapping applications at a scale of 1:50000. In order to improve the elevation accuracy of satellite images, the satellite is equipped with a single beam laser altimeter to obtain high-precision laser measurement points. Research has shown that by using the joint regional network adjustment method and combining laser height measurement with stereo images, the elevation accuracy of stereo images can be significantly improved. In the experiment, the elevation mean square error of ZY3-03 star three line array stereo images in the central region of Heilongjiang Province and the Taihang Mountains region of Hebei Province were significantly reduced, meeting the accuracy requirements of 1:50000 scale stereo mapping in China. This research achievement provides strong support for improving China's satellite remote sensing technology level and geographic information resource construction.”