Permafrost is gradually degraded with climate warming， which seriously affects the stability of engineering construction in permafrost regions. Therefore， real-time and accurate monitoring of permafrost changes is urgent. Synthetic Aperture Radar Interferometry （InSAR）， as a new type of earth observation technology， can monitor the surface of permafrost regions on a large scale at all times and in all weather， and become an effective monitoring method. This paper aims to introduce the research progress and future development trends of InSAR technology in permafrost regions in the past two decades. Firstly， the basic principle of InSAR technology and SAR system are introduced. Then， based on the development of InSAR technology， the application of D-InSAR and multi-temporal InSAR in permafrost regions is outlined. It also summarizes the currently developed freeze-thaw models and analyzes the influencing factors of surface deformation in permafrost regions. Finally， look forward to the future development trend and main problems of InSAR technology in permafrost monitoring， in order to provide scientific research personnel with a systematic application introduction.