Injection mold design is a complicated,empirical,long time costed and high qualityrequired process.To design a qualified mould,the designers are required to possessthorough and broad knowledge.Therefore,presenting and storing the knowledge ofinjection mould in the design system is one of the forefront researches of computer aidedinjection mold design.Intelligentizing the design process,shortening the designing cycletime and reduce the cost of it are the ultimate purpose of the research.With the financialsupport from the Technology Project of Guangdong Province (2005A1047001),themethodology of knowledge integration has been studied in this thesis.Confronting with the increasing requirement of modem design,this paper proposes amethod based on knowledge-base technology and CAD/CAE/CAM system to integrateknowledge in injection mould design process,and also builds the framework of theintegrated system.To develop the system,several key technologies are emphaticallystudied in this paper.Knowledge base is the indispensable component of the knowledge based system.Atask-structure oriented approach to construct a hierarchical and systematic knowledgerepository is applied to this research.By utilizing the knowledge element,design task anddesign case,the design knowledge can also be reused in multi-granule.Injection mould designer always adapts the solution of a previously solved case to seta solution for a new problem.And the case based reasoning method is suitable for theprocess of injection mould design.Efficient retrieval model is critical for case-basedreasoning.In this paper,the function of products is considered as a factor of the retrievalmodel,and the case model is constructed based on this retrival model.Simulation knowledge based overall evaluation of the design schema is very essential.Founded on theoretical analysis and practical experience,this study analyzes the results ofCAE from various aspects,such as flow capability,process variables,apparent defects andprocess parameters,etc.,develops the indexes of evaluation for the design of injectionmold,and defines the objective function of the evaluation.Evaluating the design schema of injection mold following the steps as results check,evaluation and parameters check etc.is promoted.The integration of CAD and CAE meets the need of realizing the combination ofmodeling with simulating.Constructing the unified data-model is critical for realizing theintegration of CAD and CAE.Based on feature modeling,this paper presents a model tointegrate CAD and CAE datas,and develops the integrated CAD/CAE prototype system.On the basis of the above theoretic achievement,a knowledge based prototypesystem has been developed,and some cases are illustrated the application of this system.