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When designing large-sized complex machinery products,the design focus is always on the overall performance;however,there exist no design theory and method based on performance driven.In view of the deficiency of the existing design theory,according to the performance features of complex mechanical products,the performance indices are introduced into the traditional design theory of “Requirement-Function-Structure” to construct a new five-domain design theory of “Client Requirement-Function-Performance-Structure-Design Parameter”.To support design practice based on this new theory,a product data model is established by using performance indices and the mapping relationship between them and the other four domains.When the product data model is applied to high-speed train design and combining the existing research result and relevant standards,the corresponding data model and its structure involving five domains of high-speed trains are established,which can provide technical support for studying the relationships between typical performance indices and design parameters and the fast achievement of a high-speed train scheme design.The five domains provide a reference for the design specification and evaluation criteria of high speed train and a new idea for the train’s parameter design.