Our key project, CROWN (China Research and Development Environment Over Wide-area Network), aims to empower in-depth integration of resources and cooperation of researchers nationwide and worldwide using grid technologies. It adopts service oriented architecture. Current service grids do not consider the separation of services and underlying resources, potentially causing low job processing efficiency and resource utilization. In this paper, we propose a novel architecture for grid systems, called Open Service Provisioning and Consuming Environment (OpenSPACE). OpenSPACE is adopted by CROWN and is evaluated by prototype implementation based on real applications.