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To clarify the division and characteristics of Gongshan tectonic units in northwestern Yunnan��the authors collected and collated different scaled regional geological survey data��and then obtained four new under- standings: �� tectonic units are divided into Dulongjiang magmatic arc and Bingzhongluo block��and the demarca- tion between them is the inclined eastward Gaoligong Mountain thrusting nappe fault; ��Dulongjiang magmatic arc belongs to Tengchong orogenic belt��while Bingzhongluo block belongs to the Three ��iver orogenic belt��which are separated by Meso-Tethys; �� the Meso-Tethys opened in Middle Jurassic��westward subducted in Late Jurassic- early Early Cretaceous��and closed in later Early Cretaceous and Late Cretaceous; �� Bangongcuo-Dongqiao suture zone in the district has been covering by the Gaoligong Mountain rock group which westward thrust nappe��