Abstract: The energy consumption data collected from a ship are analyzed from in terms of navigation route, and a route planning method is developed for energy saving.The model of navigation area is constructed by using grid method.The ship oil consumption model is built through data fitting and integrated into the navigation area model, reflecting both impacts of environment parameters and of ship parameters.An ant colony optimization algorithm with double ant colonies, the “mileage aunt”and the “energy consumption aunt”.The model is used to planning route for the ship and the process of iterative calculation and the effect in energy saving are demonstrated.