Abstract: In Tria ssic period,Qiangbei-Changdu area is a paraplat forma reaplaced between Jinsha jiang river oceanic basic and Bangong lake-Nujiang river oceanic basic. Tanggula shan area is an excessive a rea between Qiangtang area and Changdu area,which is situated on east of Qiangtang area,and is located next to the west of Chuangdu aera. Tanggula shan area may provides both Qiangtang area and Chuangdua rea with important reference material through reseaching its sedimentary environment.