Based on Wickens" information processing and cognitive model, the relationship between attention resources and control workload is constructed. Based on the SIR model, the dynamic equations of attention resources and control workload are established. The stability of the equation at the equilibrium point is proved by Lyapunov stability theorem. Based on this algorithm, the opening and closing valve for sector operation is designed. Sector opening and closing valve can provide decision support for team resource management and sector opening and closing decision. Through numerical simulation, the evolution rules of attention resources and residual workload of controllers are verified. The sector opening and closing valve can provide sector opening warning for large flow and capacity environment and predict the future workload of controllers.