These two sentences in Du Xunhe's Send People to Visit Wu in the Tang Dynasty are the most famous to describe the architectural features of Suzhou City in past dynasties. Suzhou was called Wu and Wuxian in ancient times, and it was the capital of Wu in the Spring and Autumn Period. Although the overall layout of the city has experienced thousands of vicissitudes, it has never changed. However, due to the economic prosperity from generation to generation, the number of residential houses is increasing from generation to generation, and the land in the inner towns and cities is getting less and less, so there is a saying that there is less idle land in the ancient palace. The narrative is appropriate. But there are objective reasons for "less idle land". Suzhou is a veritable water city, criss-crossing inland river water network, which more clearly reflects the many water ports and bridges and less idle land, highlighting the characteristics of "small bridges and flowing people".