Cloud manufacturing is a new service-oriented networked manufacturing paradigm which can integrate various physical manufacturing resources and manufacturing capacities and provide manufacturing services of the lifecycle for the product. It is a new research direction in the field of the advanced manufacturing. In this paper, a provisioning method of service resources for cloud manufacturing is studied. Firstly, the service-oriented architectures are investigated to decide the service architecture for the encapsulation of manufacturing resources. Then a three-step provisioning method of manufacturing services are proposed, a function-classification based manufacturing service interface is defined, and the encapsulation strategies for four categories of manufacturing resources including intelligence resource, knowledge resource, tool resource and manufacturing capacity are put forward, and the dynamic provisioning process of manufacturing service is described. By the proposed method, the four categories of manufacturing resources can be dynamically provisioned as services with well-defined service interfaces for cloud manufacturing.