Abstract:The study of the disturbance process of hydrologic load on crustal stress is helpful in clarifying the relationship between hydrologic load and seismic activity. Using the seasonal signal of GPS time series in Nepal, the seasonal three-dimensional displacement field and stress-strain field model in this region is constructed. The modulation effect of seasonal hydrological load on seismicity in this area is studied by combining rainfall and seismic catalogue. The results show that: 1) there is a strong spatiotemporal correlation between seasonal surface displacement and rainfall; 2) the rainfall in monsoon period disturbs the long-term movement trend of the fault and releases the Coulomb stress to a certain extent, thus inhibiting the seismic activity and affecting the time of the earthquake.