Hangzhou Haipang was built during the Ming and Qing Dynasties to resist the impact of sea tides on Hangzhou. The sea ponds are mainly ichthy scale large stone ponds, which are interlaced with large stone materials, each intersection is chained with tenons, the joint is sealed with putty, and iron ingots are added to make all the stones join together. Within the body of the pond, additional earth ponds, forming two lines of the front and rear.Some of the lots are earth ponds and grass ponds. At present, 4 sections of the upper city have been found, including the sunset community section, the southern section of Qiutao Road, the Hanghai section and the Laohanghai section. The magnificent scale of Qiantangjiang Sea Pond is of great significance to the study of water conservancy engineering construction technology and Qiantangjiang geological vicissitude