The intelligent design technology based on the Expert System (ES) was applied into injection mould design. The experts’ knowledge and experience related to the injection mould project design (IMPD) was expressed in the form of production rule. The knowledge base of intelligent project design of injection mould was constructed. The knowledge automatic reasoning via CLIPS (C Language Integrated Production System) knowledge deducing machine was realized. The achievement of the injection mould project’s intelligent design was reached. The research on the injection mould intelligent design based on CLIPS was made. The intelligent design system for injection mould project (IDSIMP) was developed. The injection mould design project could be provided to the injection mould design engineers via the system. The system is of better application value on engineering.