Territory of three-parallel-rivers composing by Nujiang, Lantsang and Jinsha Rivers in Tibet Plateau is a key zone for the study of the geological environment and nature resource development of Tibet Plateau. The investigation of active landslides in full coverage, the study of their development and distribution rule not only play an important role in slope disaster reduction and prevention, but also in geological science research. Take the 179,000 km2 study area of the pan-three-river parallel catchment as an example. It is demonstrated the workflow and key technologies of the whole process: InSAR big data processing → landslide interpretation → deformation pattern recognition → development law analysis → key sections analysis, obtained active landslide data of medium-small scale in study area. The research results show that，(1) The existing SAR data sources, InSAR technology and interpretation methods can meet the needs of small and medium-sized large-area landslide identification, and the time is ripe for complete InSAR recognition of landslide in China；(2) The "phase resonance enhanced InSAR" (PRE-InSAR) technology designed for the rapid calculation of large redundant SAR observations can eliminate most of the adverse interference conditions, highlight the location, range and activity intensity of landslides, and effectively complete the InSAR data processing suitable for large-area landslide identification, which has the potential of popularization in technology; (3) There are five-category deformations comprising landslide, glaciers, frost heave, scattered and altitude difference, referencing geomorphology and optical remote sensing images, and considering the formation and lithology, geohazard mechanism, triggering factors, combing 10 classes geomorphic development location; (4) A total of 904 active landslides were interpreted，it is mainly distributed in eight sections of three-river, namely, Wangbudui-Paoluo, Songxiong, Zhongzunong of Jinsha River; Basu of Nu River; Chaya, Chaya-Deqin and Huangdeng Reservoir of Lantsang River；(5) It is revealed that the main environmental factors that have great influence on active landslides are river erosion, topographic slope, stratigraphic lithology, rainfall and temperature in order, while the spatial distribution of active structure and earthquake is not significant. The mutual feed between landslides and human activity is a major characteristic of the development of landslides in this region；(6) InSAR identification results more comprehensive and objective in reflecting the rules of the natural development of landslide, deepened to the understanding of the three-river region geohazard, can provide important support for the active landslide prevention & control of Tibet Plateau, but InSAR observation and interpretation has multiple solution of active landslides. The next step is to develop a standardized InSAR identification workflow and conduct multi-source data fusion observation.
