Abstract: If coseismic deformation of the earthquake region can be obtained in a short time, it is important for timely evaluate the disaster and cooperate with the development of earthquake relief work. Space geodesy technology has the advantages of high monitoring accuracy and high spatial resolution, and has been widely used in seismic deformation monitoring related fields. The coseismic deformation obtained by processing space geodetic data can intuitively show the surface deformation caused by the earthquake and provide a reference for judging the disaster situation. However due to the lag of data acquisition, it is often impossible to provide coseismic deformation map in a short time after the earthquake. In this paper, using the near real-time focal mechanism solutions of the USGS NEIC, seismic elastic dislocation model and seismic empirical formula, a seismic deformation simulation application based on Android smartphone (namely Codefmap APP) is developed based on Java and Python language. The program has the functions of earthquake catalog query at any time in the world, actively obtaining USGS NEIC source parameters, displaying epicenter position and automatically calculating coseismic deformation. For important events, the deformation simulation results can be given within one day, especially for blind earthquakes. It can provide a reference basis for determining potentially dangerous areas and early earthquake relief to a certain extent.