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A straight path tracking method of an Unmanned Surface Vehicle(USV)based on fuzzy control is presented in this paper for the electrically propelled USV,who was equipped with twin fixed propellers. We determine the current state of the USV by the distance of the USV to the target path and the difference between the actual heading direction and the given path. The fuzzy algorithm is used to adjust the input voltage of the right and left propulsion motor timely to change the motion state of the USV, so that the USV can track a straight line autonomously. The fuzzy controller has two inputs and two outputs, and accurate mathematical models needn’t to be established. The simulating experiments in different cases of initial position and pose of the USV with respect to the straight line demonstrate the effectiveness of the method. By comparing with the PID method, The simulating experiments show that the proposed method can avoid the big gyration that appears when PID controller is used at large initial deviation of course angle, e.g.,. In comparison with PID controller, the fuzzy PID has better performance in overshoot and regulation time at small initial angle deviations, e.g.π/4,3π/7,π/2.