In order to evaluate the applicability of different atmospheric correction methods to the deformation rate of interferometric synthetic aperture radar (InSAR) technology, especially in the time series deformation calculation, the principles of two typical InSAR atmospheric correction methods, namely the Generic Atmospheric Correction Online Service for InSAR (GACOS) and common-scene-stacking, are introduced. Taking the central Tibet as the study area, the two methods are applied to the atmospheric correction of InSAR interferograms to evaluate their performance in time series. The atmospheric correction effect on long-term baseline interferograms of more than one year is presented, and finally, the equivalent cumulative deformations in central Tibet are derived. The results show that for a single interferogram, the atmospheric correction effect of the common-scene-stacking method is significantly better than that of GACOS with unstable results, and the common-scene-stacking method can reduce the standard deviation by more than 60%. In terms of time series, the atmospheric delay trends provided by the two methods are similar, but the specific values differ greatly. GACOS can improve the time series results of InSAR. It is recommended to choose one or a combination of the two methods according to actual needs, based on their advantages and disadvantages.