Tropospheric delay is one of the important error sources of deep space interferometry.In this paper, the influence of temperature, humidity, pressure and other meteorological parameters on Saastamoinen zenith delay model is firstly analyzed, and the influence amplitude of each parameter is obtained, and the requirements of certain tropospheric delay accuracy on the accuracy of meteorological parameters are given.Then, the mapping amplitude deviation of NMF and VMF at different elevation angles is compared and analyzed. The results show that when the elevation Angle is higher than 10°, the mapping amplitude deviation is less than 0.005.However, NMF is more suitable for deep space interferometry because of its simple form and low computational cost.The influence of meteorological parameters on measurement accuracy and the analysis of mapping model provide basis for the design of meteorological parameters measurement accuracy index and the selection of mapping function applicability.