Hong Kong is a unique city with a combination of Chinese and Western characteristics. It has both Chinese traditional culture and the shadow of western culture, especially British culture. The Pingshan Heritage Trail, located in the Tang clan in Pingshan, Yuen Long, Hong Kong, has a long history and is of great research value. Through the author's on-the-spot investigation in the course, consulting historical materials, and taking Deng clan architecture as an example, this paper deeply analyzes and studies the clan value, historical education value and social development value of ancient buildings, and then puts forward some suggestions on the protection and planning development of traditional clan architecture.