Traditionally, system resource management software is tightly tied with managed IT resources through their specific manageability interfaces. Applying Web Services technology to the field of system resource management is a reasonable way to loosen this tie. In this paper, we discuss the implementation of SOA principals to the system resource management field, and then use WSDM standard and WS-Management standards to design and realize the resource management middleware model. We illustrate how Web Services management standards are mapped and integrated with existing management interfaces, such as JMX, WMI, and so on. As part of our experimental work, we discuss MUSE-JMX and Wiseman-WMI based system management implementation schemes, including Manager Layer, Gateway Layer, and Resource Agent Layer, and then we analyze the experiments results. After that, from our research experiences and related surveys, we analyze the gap between WS-Management and real management fields and design some feasible solution for these gaps. Finally, we discuss the prospective research direction and challenges in this field.