It aims at the problem of complex process and low efficiency in the process of building ship curved block, the simulation and design research of curved block construction were carried out. The object is the virtual assembly line of ship curved block, a control scheme for the CONWIP (Constant work-in-process) virtual assembly line for the construction of ship curved block was proposed. Based on the DOE theory, the important parameters in the scheme are set and a virtual simulation model was established in the software. The simulation results of different loops in the control system are compared and analyzed, select and optimize the control scheme; The applicability of the CONWIP control system in the virtual assembly line of ship curved block construction was determined by simulation. The experimental results show that: in the case of the same amount of work-in-progress inputs, CONWIP control improves production time by 17.6%~25.1% compared to KANBAN control, the production rate has increased by 13.6%~22.7%; It effectively solves the low production efficiency of ship curved block, problems with waiting for machining operations.