Abstract: Although the tight clastic rock reservoir in Western Sichuan depression is rich in geological reserves, the characteristics of poor physical properties, wide distribution, many strata, fracture development, strong heterogeneity and complex fluid relationship caused by complex geological conditions aggravate the difficulty of exploration and development. In view of the complexity and particularity of Xinchang exploration area in Western Sichuan, the fracture reservoir is equivalent to anisotropic reservoir, the wave equation forward modeling of VTI and HTI media is carried out, and the seismic response characteristics of fracture media in this area are analyzed. The analysis of wave field simulation results shows that the existence of fracture medium will cause the amplitude and travel time changes of reflected wave field;on the other hand, according to the travel time changes, the fracture development angle range can also be estimated.