The ice-water phase transition in the active layer will lead to seasonal frost heaving and thawing and the melting of underground ice at the upper limit of permafrost will lead to long-term subsidence of the surface. Understanding the seasonal and long-term variation rules of surface deformation can provide a new perspective and method for remote sensing monitoring of permafrost state. Taking the northern boundary of the permafrost area of the Qinghai-Xizang （Tibet） Plateau （Xidatan-Kunlun Pass） as an example， this paper uses the C-band downorbit Sentinel-1 data and SBAS-InSAR technology to obtain the surface deformation results of the permafrost area of Xidatan-Kunlun Pass from 2014 to 2020. By analyzing the time series of surface deformation and extracting the long-term deformation rate and seasonal deformation， this paper also discusses the permafrost deformation law in this region. The results show that there are large spatial differences in the discontinuous permafrost region in the Xidatan area of the northern boundary of permafrost， and the long-term settlement rate and seasonal deformation in permafrost region are higher than those in seasonal permafrost region. In addition， the surface subsidence of high-temperature permafrost is more significant than that of low-temperature permafrost. The spatial distribution characteristics of deformation are closely related to geomorphic units. Compared with the Xidatan area， the long-term deformation rate and seasonal deformation variables in Kunlun Pass and the high plains area of Chumar River are obviously increased. At the same time， the deformation law is further studied by combining the data of the thermokarst ponds. In the early stage of the development of the thermokarst ponds， the melting of underground ice increases the regional seasonal deformation. With the expansion of the thermokarst ponds， the long-term settlement rate of the region is intensified， and the regional seasonal deformation may decrease after the further development of the thermokarst ponds.