To improve the optical measurement accuracy of exo-atmosphere spacecraft’s miss distance,a processing algorithm based on the same frame film data of multi-devices was presented.Firstly,the basic principle of miss distance measurement by optical method was put forward.Secondly,the influence on exo-atmosphere spacecraft’s miss distance by the angle measurement data errors was analyzed.Then,the sparse parameter algorithm based on the same frame film data of multi-devices was set up,and the precision of miss distance influenced by measurement errors was analyzed.Finally,the simulation results in typical cases were supplied.The simulation results show that the CCD exposure time error and the focal length error must be corrected in the optical measurement of exo-atmosphere spacecraft’s miss distance,and the precision of miss distance can be improved by using the redundant same frame film data of multi-devices.