Abstract: This paper analyzes Wf-XML based interoperation mechanism between workflow management systems and the characteristics of Web Services based description methods for network management services. Making use of the description methods for network management services given by MUWS, the deficiencies of Wf-XML are improved and interoperation interfaces between network management business process management systems are defined. The implementation and application scenarios of the interoperation interfaces are also illustrated. The functionalities of the interoperation interfaces are clearly defined with good extensibilities.