Abstract: With the increasing complexity of power grid operation mode, the convergence of traditional integrated power flow calculation is deteriorating. In view of this situation, this paper proposed an anderson-acceleration-based power flow method. Firstly, the integrated power flow calculation of transmission and distribution networks was abstracted into a simple fixed point iteration form, and its convergence was analyzed by using the fixed point iteration theory. Then, according to the iterative nature of power flow calculation, combined with the idea of anderson acceleration in the fixed point field, the anderson-acceleration-based power flow method was proposed. Besides, the equivalent method was used to improve the convergence performance of the method in the network with loops. Finally, in the part of case study, the accuracy of the proposed method was verified firstly, and then the convergence performance of the proposed method was compared with the existing methods in various scenarios; hence the advantages of the proposed method in convergence performance were verified.