The whole ship finite element model is established to simulate the process of ship launching from dock, and the hull structural deformation, docking block support reaction, and hull structural strength are checked during the launching. The result shows that the stern local stress and docking block support reaction are out of criteria and there is damage risk. By the stern local structural strength, docking block arrangement scheme optimization, and structural hard points elimination, optimizing the stress distribution and balancing the docking block force bearing are realized, which can guarantee the safety of hull and support system during the ship launching.