We simulate the motions of a hull and of oars in order to improve rower's body motion and equipments for a faster hull speed and high efficiency. We established the simulation that solves energy equations of the hull, the rower, and the oars. It estimates the load that acts on the oar blade as unsteady force. The force that pulls the oar handle and the motion of the mass center of the rower are the input values to the simulation. The input values represent the rower's performance, that is, the rower's power and the way to move rower's body. The results of the simulation are in good agreement with the In-situ experiments, so that the simulation can be used as VPP (Velocity Prediction Program) to evaluate the improvement of rower's body motion and equipments.