Abstract:In recent years, waterlogging disasters in flood seasons have caused heavy casualties and property losses. Urban drainage and waterlogging prevention has gradually become the focus of attention.SThe article analyzes the main causes of the rainstorm waterlog on October 10, 2021in an area of Suzhou, and puts forward the preventive measures to improve the rainstorm waterlog specially from the aspects of planning, design ,construction ,maintenance and management to be favorable for the harmonious development of the economy and society in this area.