Abstract: This article studied the flow of structural mapping in 2D/3D work area, analysed the primary factors which depress the mapping precision in traditional methods for structural mapping, and then put forward the building of average velocity volume in the mapping flow.With regard to the 2D work area, the "similar variation velocity calibration" was adopted, the time-depth no rm was compiled and the clogging of cross point in 2D offsetting section and map migration for depth structure was realized.All these measures can improve the precision of structure map.According to the 3D work area, we use Depth-team software and 3D vision software, binding with more physical and geological information to correct the average velocity volume interactively.The practical applications show that the new flow improved the precision of structural mapping and it is a technique-advanced, time-efficient and practical flow.