Thinking about small and medium enterprises cannot afford the fee of establishing parts library, developed parts library system taking cloud manufacturing mode. Describe the business mode of parts library in the mode of cloud manufacturing, determine functions of the system. The architecture Cloud manufacturing includes several layers, taking Force data mode and two ways of separating data to create database, through server assemble and data separate vertically to realize system extend. X3D was used to display parts and EAI to interact dynamic; Class, tags and ontology to organize parts. Developed a system named CMoPL, through using practically finding the system is easy to search parts and friendly interface. The system can help enterprises to advertise and sell parts; can reduce the difficulties of enterprise information.