Promoting the inheritance of the traditional skills of time-honored brands, and realizing the development goal of "the inheritance is not a mere imitation of the ancient styles, and the innovation is not leaving behind the tradition” , is not only to promote brand building, but also an important measure to promote Chinese traditional culture. Brand authenticity management provides theoretical support for the time-honored brands to realize the inheritance and innovation of "originality". Based on the case study of Suzhou Daoxiangcun, this paper constructs a theoretical model for the inheritance and innovation of time-honored brands based on brand authenticity management. The research results show that：(1) the original authenticity management of the brand has realized the inheritance of the time-honored brands and ensured the "originality" of the time-honored brands；(2) the constructive authenticity management of the brand has promoted the brand innovation based on the "originality" of time-honored brands and realized the sustained growth of brands；(3) based on the satisfaction of customers' functional needs, experience needs and emotional needs, it has promoted the inheritance and innovation of the time-honored brand's products, marketing and culture respectively. Multi-level customer demand is an important driving factor for the authenticity management of time-honored brands.