Abstract: It's a trend that the aircraft onboard machine-electronic equipment is controlled and managed integrated by using the distributed processors and the network technology. How to assign the tasks of control and management to the distributed processors to balance the risk factor of system is the key technology in the problem of integrated control and management. It's also the main technology to improve the system reliability and safety. The fact is a combinatorial optimization problem. In this paper, the task assignment rules and object function are presented. The best strategy of the task assignment is searched by using the genetic algorithm, and the results are illustrated.