As resource management becomes a hot research in Grid Computing area,current research forces on solving heterogeneity of grid environment,but the research on enhancing the efficiency of resource management on condition of delivering seamless QoS(quality of service)is not very abundant.In addition,current research about Grid QoS forces on importing related fruit on QoS from multimedia network to support Grid QoS.For that,a hierarchical structure of gird QoS is proposed in this paper.QoS parameters are newly classified into five categories and they can be measured at VO(virtual organization)layer.Then by making use of SNAP(service negotiation and acquisition protocol),the analysis on QoS parameter mapping and converting based on the hierarchical structure model is also addressed.At last,the research on Grid QoS is applied to scheduling heuristics to improve on Min-Min algorithm.The result of the simulation shows that QoS-based resource management can effectively improve grid resource utilization and service ask for success rate in dynamic service-oriented grid.