In this paper,a delayed ratio-dependent Holling-Ⅲ predator-prey system with stagestructured and impulsive stocking on prey and continuous harvesting on predator is considered.The authors obtain sufficient conditions of the global attractivity of predator-extinction periodic solution and the permanence of the system.These results show that the behavior of impulsive stocking on prey plays an important role for the permanence of the system.The authors also prove that all solutions of the system are uniformly ultimately bounded.The results show that the biological resource management is effective and reliable.