According to the modularization, standardization and other characteristics of automobile body welding jig, based on design experience, the analysis and summary of jig structures, research on knowledge-based intellectualized CAD system of automobile welding jig is carried out on the CAD software platform of NX. The model of knowledge-based intellectualized CAD system is established firstly. And then the concept of outer process repository and inner design repository which include design repository of rule, module repository and case repository is put forward. Outer process repository is the knowledge representation of automobile body processes, welding jig design process sheet and design standards. The case base of automobile welding jig is constructed. Group technology (GT) is applied to the coding data base of jig. The algorithm of search case called vector comparison is applied to reasoning machine in the intellectualized CAD system.
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