For product innovation design,the process of determining the sub-functions and abstract logical relationship is very complex,a product innovation design method based on CAI technology and TRIZ theory was proposed.The collected product design demand was classified into several sub-demand groups according to the principle of semantic proximity.The first-level sub-functions of the sub-demand groups were retrieved through Goldfire software.The function elements were defined and decomposed based on the working principle of the first-level sub-functions.The functional carrier was designed according to function elements.Patent library and TRIZ theory were used as guidance to complete the design of product structure,and patent infringement judgment was made.Finally,the feasibility of the method was verified by the chain link fence automatic packaging machine.