Abstract: Firstly, the orbit of the Magpie bridge satellite is analyzed, and the orbit of the Magpie bridge satellite mission is given by numerical method. Then, the time window of the satellite laser ranging observation of the Yunnan Observatory in the second half of 2019 is calculated. The laser ranging distance range from the Magpie bridge satellite to the Yunnan Observatory and the minimum distance between the orbit of the Magpie bridge satellite and the moon are given. The theoretical number of echo photons and the probability of ranging success of the Magpie bridge laser ranging are calculated. According to accumulated experience on lunar laser ranging, combined with the factors affecting the ranging, an improved method for improving the number of laser ranging echoes and the success rate of ranging is given. Finally, an equivalent test plan is designed to verify the theoretical calculation through the measured results.