The knowledge base is defined as a collection of experience, rules, cases and other knowledge. In knowledge-based engineering design methods, knowledge including expert knowledge, experience and product design standards, product specifications and successful precedent will be collected, sorted and summarized into a number of rules, analysis and problem-solving strategies, and is placed in a particular form of the document or database to constitute a knowledge base, which can achieve storage and classification management of product design knowledge and provide best guidance and recommendations for the designer during the design process. Significant improvement in efficiency and quality can be realized, if the knowledge base can be used in a number of ways: (a) to communicate knowledge with fellow workers and disseminate knowledge to other people; (b) to reuse knowledge in different ways for different purposes; (c) to use knowledge to develop intelligent expert systems that can perform complex design tasks. Knowledge Base Design is illustrated in Fig. 2, which consists of expert knowledge, experience, successful or failure cases, design criteria, standard and so on. It stores, classifies and manages kinds of knowledge to facilitate designer to use. The methods of storage mainly include the following two methods, saving in power copy or document templates. With the aid of the catalog editor tool, it manages kinds of knowledge to classify chapters and families. Moreover, taking advantage of a variety of established knowledge about the product design and process, the workload of the designer is eased, instead of determining rational solutions for similar problems over and over again, so the conventional design process can be accelerated by using knowledge-based engineering (KBE).