The decorative patterns of Tang dynasty (DPTD) combine Chinese and western styles, providing inspirations to designers. The main purpose of the study is to summarize aesthetic cognition for DPTD and improve modern Tang style products design, thus introducing new materials and ideas to modern products design. The event‐related potential (ERP) and eye‐tracking were mainly used to study DPTD, exploring early reactions of brain nerves in the process of aesthetic cognition of DPTD, and analyze people's aesthetic process during tests. The results showed that attractive DPTDs attracted more fixation counts and longer second fixation time than those of unattractive DPTDs. When watching attractive DPTDs, pupil sizes of subjects were significantly smaller than those of unattractive DPTDs. In addition, attractive DPTDs induced larger amplitude of P300 than unattractive. N2 was strongly activated in the parietal and occipital areas, whereas P300 was strongly activated in the prefrontal to parietal areas. At the same time, this study found that in the process of people's aesthetic appreciation, attractive DPTDs would make people have a pleasant subjective feeling. This study adopts the method of combining ERP with eye‐tracking and provides a new method and design idea to guide the design of modern Tang‐style products.