The Jiulongshan structure is key one in northwest Sichuan.This paper deals with its structural geometry based on seismic data.The study indicates that the Jiulongshan anticline was affected by both the Micangshan structure and the Longmenshan structure and subjected to three tectonic superimpositions.Structural kinematics is modeled based on which an approach to the multiple structural superimposition,oil-gas migration and accumulation are made.