Aiming at the complex working contacts and game relations between the main manufacturers and suppliers in the process of scheduling for complex product development, a multi-level GERT model is constructed based on the multi-level development network of the complex product, finding the functional relationship between the overall schedule and various suppliers schedule. By further analyzing the equilibrium relationships of game-agent, such as the Pareto equilibrium, Nash, and others, “super-conflict equilibrium” game model is established for schedule planning. Finally, a numerical example is utilized to illustrate the effectiveness and practicality of the proposed method.