Abstract: In order to effectively improve the management of ship building process, an optimization model for expansion of three-dimensional curved hull plate is proposed based on an expansion method with a constant unit length, taking the steel plate cutting and plate conforming technology into full consideration. The error of area, linear degree of borders, and mean strain energy are taken as objective functions. The multi-objective memetic algorithm (MOMA) with heuristic operator is adopted to solve the optimization model of three-dimensional curved plate expansion of ship hull. Based on the analytic hierarchy process(AHP) method, multiple solutions are selected to obtain the final expansion surface. By comparing with the geodesic expansion results, the effectiveness of the optimization algorithm is verified. Besides, the effectiveness of local search operator and heuristic operator in the algorithm is further verified.