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A new load flow method for large shipboard power system with multiple generators which combined Gauss-Seidel method and forward-backward method is presented. In the proposed method, an shipboard power system is divided into a main power supply network and several radial distribution networks, which are deal with respectively. The forward-backward sweep method is used to solve the power flow for each radial distribution networks, and the Gauss-Seidel method is used to solve the power flow for the main power-supply network in which the radial distribution subnetworks are modeled to equivalent current injections. The two methods utilize the solutions of each other, and the final result can be obtained by iteration. Tests are conducted on a typical shipboard power system. The results validated the proposed method and demonstrate that it has better convergence on large shipboard power system network than tradition method.