The energy harvesting from ocean waves is one of the most promising technologies. However, conventional energy converter is fixed at sea, which restricts its installation location and inability to energize the ship at all times. This study preliminary investigates the motion of a bistable energy converter stimulated by ocean wave excitation. The bistable energy converter is fabricated by a bistable structure with oblique supported spring mass system, and it has two stabilizing positions, making it easier to vibrate. In the beginning, the wave motion and energy spectral density are analyzed to derive the wave frequency with the highest energy density. Subsequently, the roll angle of the ship in regular waves is established based on motion equation of the ship. Furthermore, the motion equation of the bistable energy converter is established with the roll angle of the ship in regular waves. Simulation result shows that the bistable energy converter exhibits obvious bistable motion in regular waves.