Abstract: Canxue and Duanqiao Structures are large-sized anticline that is mainly formed by compression of Longjing Movement in late Miocene. Exploration target intervals mainly distribute in Huagang FM of Oligocene. Faulting distribution and mechanism, magmatic activity and local structure characteristics are analysed in this paper. Petroliferous evaluation is made from structure reliability, trap area, local structure type and source-reservoir-cap assemblage.