Abstract: Recently, large Cenozoic Gangmari-Juhuashan thrust structure were discovered at the Gangmari area in central Qiangtang, Qinghai-Tibet Plateau, extending more then 200km in length, whose general strike is nearly EW. It constitutes main boundary of the northern Cenozoic Gemucuo basin. The best outcrop is at gangmari, showing imbricate structure formed by a series of single-impulse-type thrust fault. The dip of inverse transversals is N and inclination is 12~20°. The thrust direction is 190~200°. The discovery of the Gangmari-Juhuashan thrust structure provides significant new structure data for the evolution of the Cenozoic Gemucuo basin and petroleum resources assessment of the basin, which is great significance to research the manifestation of plateau uplift in Qiangtang.