Abstract: This paper studies the dynamic response (including the ship motion andvibration of the half-body) of a catamaran with asymmetric cross section half-body in head wave condition. Since the principal inertia axis of the cross section does not coincide with the direction of the ship motion, the two half-bodies are restrained by each other through two fixed pcints, studying the response by BISHOP'S THEORY of hydroelasticity of ships 1 is dif-ficul. In this paper, the hydroelasticity motion differential equatio...