Considering the difference between the ship DC regional distribution network and traditional ship distribution network in the structure and power model, based on the mathematical model of ship DC zonal power distribution network, this paper puts forward a new kind of method for load flow calculation. According to the characteristics of DC power system, it makes some change in forward backward method and Newton-Raphson algorithm and separates the the ship DC regional distribution network into two parts. The improved DC network power flow calculation method of the ship is used to respectively calculate each part. At last a ship DC regional distribution network example is caculated and analyzed, which validates the correctness of the method.