Abstract: According to general seism ic survey, high-accurity detail gravity survey and detailed materials of surface geology, this paper probed into the characteristics and mechanism of formation of structures in deep and shallow stratigraphies in Tousitai area，in which， in deep stratigraphies Palaeozoic metamorphic bases were the combinations of structures of transpression horsts and grabens from which we supposed a zone of high horsts, a zone of low grabens and two slope zones, in shallow stratigraphies the Mesozoic and Cenozoic structures were slip-fold ones formed by gravity action and showed the combinations of grjvity-deiachment structures. Though Tousitan area stood the development of multicyclic structures , the structures , the-re were mainly formed during Himalayan orogeny.