Abstract:The distance of common converted point ( CCP ) of converted wave relative to common mid point (CMP) changes with such factors as ratio of P- and S-wave velocities, depths and offsets,which can't use fixed gathers to conduct analysis of converted wave velocity,whereas use different gathers to conduct velocity analysis when ratio of velocities and depths change. The paper presented a method of analysis of converted wave velocities that sorts traces dynamically along with the variation of ratio of velocities and depths of converted points,which realizes the correspondence of sweeping stack velocities and depths of converted points with common converted point gathers. It is shown by theoretical model and real seismic data that the method is effectiveness