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Distribution power flow calculation is base of distribution system analysis. The characteristics and differences of Back/forward sweep method and Newton method are compared and analyzed, and a modified back/forward sweep method is proposed based on the conventional back/forward sweep method, in which the correction equation of node voltage in the back sweep process is just simply replaced by a new equation. The proposed method not only is simple and fast like back/forward sweep method, but also has better convergence characteristic like Newton method. The results of simulation tests presented show the proposed method has faster power flow solution of radial distribution system and better convergence characteristic when compared with the conventional back/forward sweep method.