Abstract：In face of difficult static problem encountered during exploration in complicated mountainous area of the West of China,the paper presented a reasonable and effective model constrained 3-D first beak refraction static correction.Fully using a priori surface information from surface survey and combining with first break of refraction in production shot,the paper calculates more precious velocity and thickness of near surface layers vertically and laterally,builds up regional reasonable surface model in the area and finally calculates static corrections with high quality.The paper analyzed the technical difficulty of 3-D static correction in mountainous area,summarized the experiences solved this kind of difficulties before and presented the adopted technical measures and strategies in face of complicated mountainous area.The technique better solved the difficult problem of 3-D static correction in many mountainous area such as Gumudi,Huoerguoshi,Huoyanshan and Dina etc.
