Abstract: In this study, a kind of production control policy is developed for a single-machine, multi-type products, unreliable manufacturing system with defective items, which is used to minimize the average production cost. Compared with the theoretical value, it proves feasible. It is proved optimal when the system meets to a special condition, complete analytical solutions of hedging points and an average inventory/backlog cost is obtained and the relationship between hedging points and system parameters is given. In the solution part, a computer simulation method combines with particle swarm algorithm is proposed to get the approximate value of hedging points. The influence on hedging points of initial states is discussed. Simulation results demonstrate that the method can also be applied to a system under general situation.