In order to reduce the crew training equipment cost of using real echo sounder, and as a part of marine simulator, it is necessary to develop its simulation equipment. To achieve the highly consistent between real equipment and simulator in the operation and function, a seabed echo generation algorithm has been designed, and simulated the seabed echo and clutter echo to display. And then this paper designed a mouse can pull knob algorithms to simulate the operation of echo sounder. In addition, described the implementation of interface. On that basis, the GDS101 Echo Sounder of SKIPPER is simulated. Practice result shows that the function of the echo sounder can be fully realized by the simulator. And it has been applied in the navigational instruments intelligent assessment system.