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In order to offer better support for the rapid product development of manufacturing enterprises, a networked manufacturing system for ASP (application service provider) is researched and developed. As one of the most important component of the system, collaborative design system should be an open system and has its characteristics. This paper applies the MAS (multi-agent system) technologies to construct the DBMS (database management system) of the system. Utilize UML (Unified Modeling Language) use case diagram to denote the function of the system. As collaborative design process is synergic and repetitive, its model should have the abilities to express the hierarchy and collaboration of the system. Hierarchy color Petri nets (CPN) is proposed to denote the collaborative design system. These new models built based on theories and techniques described above have exerted great guidance to the construction of the system named DLUTASP. Application cases indicate that the collaborative design system is advantageous to quicken the step of development of a new product.