The permafrost development in the Qinghai-Tibet En-gineering Corridor (QTEC) is affected by natural environment changes and human engineering activities. Human engineering activities may damage the permafrost growing environment, which in turn impact these engineering activities. Thus high spa-tial-temporal resolution monitoring over the QTEC in the perma-frost region is very necessary. This paper presents a method for monitoring the frozen soil area using the intermittent coherence-based small baseline subset (ICSBAS). The method can im-prove the point density of the results and enhance the inter-pretability of deformation results by identifying the discontinu-ous coherent points according to the coherent value of time series. Using the periodic function that models the seasonal vari-ation of permafrost, we separate the long wavelength atmos-pheric delay and establish an estimation model for the frozen soil deformation. Doing this can raise the monitoring accuracy and improve the understanding of the surface deformation of the frozen soil. In this study, we process 21 PALSAR data acquired by the Alos satellite with the proposed ICSBAS technique. The results show that the frozen soil far from the QTR in the study area experiences frost heave and thaw settlement (4.7 cm to 8.4 cm) alternatively, while the maximum settlement along the QTR reaches 12 cm. The interferomatric syntnetic aperture radar (In-SAR)-derived results are validated using the ground leveling data nearby the Beiluhe basin. The validation results show the InSAR results have good consistency with the leveling data in displace-ment rates as well as time series. We also find that the deforma-tion in the permafrost area is correlated with temperature, hu-man activities and topography. Based on the interfering degree of human engineering activities on the permafrost environment, we divide the QTEC along the Qinghai-Tibet Railway into engi-neering damage zone, transition zone and natural permafrost.