Abstract: At present the precision of migration velocity model is the key problem for the application effect of reverse time migration (RTM). Based on this, we present RTM-based migration velocity analysis method in the angle-domain in this paper. First, we develop the research of wavefront polarization method to calculate RTM-based angle domain common-image gathers. This method has definite physical meaning and high computational efficiency. Compared with conventional offset domain and shot domain common-image gathers, angle domain commonimage gathers could effectively solve multi-path problem, reduce migration artifacts and improve imaging quality of gathers. Second, we derive new angle-domain migration velocity update equation and have formed RTM-based migration velocity analysis method in the angledomain. The numerical test results of model data show the correctness of the method in this paper.