Abstract: Speed parameter of seismic wave is a key factor in seismic exploration, which can provide valuable information about subsurface structure and lithologic characteristics. Therefore obtaining accurate speed parameter is very important for seismic processing and interpretation, which is closely related with the successful process of exploration. However, normal speed analysis can not satisfy the accurate requirement of structure research because of the speed variance caused by the difference of lithologic characteristics as well as transversal & longitudinal formations in kongquehe block With the comprehensive use of seismic, geologic and logging data and adopting the combination of "Dix formula and ray tracing", spacing speed field was constructed, which has received encouraging results.