As electronic products developing rapidly，the information of the design is in-creasing and requires a more powerful data management system．The engineering design data management system is a crucial component in an ECAD framework when the design involves large volume of data in diversified format．This paper identifies the requirements for such a system and presents the approaches that support these requirements．This paper presents a data model and its corresponding DDL．This system is currently under develop-ment and will be released in the next generation of the electronic products ECAD frame-work．