Abstract: From July 29 to August 1, 2023, an extreme heavy rainfall process occurred in the Beijing-Tianjin-Hebei region,resulting in severe urban waterlogging, flooding, and geologic disasters in many places, and causing significant casualties. This extreme heavy rainfall process was characterized by higher cumulative precipitation, longer duration, and wider impact. The average cumulative precipitation in the Beijing-Tianjin-Hebei region was 175 mm in 4 days, which is more than one-third of the average annual precipitation. In the context of global climate change and rapid urbanization, the impact and influence of extreme heavy rainfall on the smooth operation of China's urban economy and society is increasing. Existing urban defense standards are not adapted to the new flood situation under climate change, and there are still shortcomings in meteorological disaster monitoring, forecasting and early warning capabilities and departmental coordination and linkage mechanisms, as well as deficiencies in the urban public's awareness of disaster prevention and avoidance. In this regard, it is recommended to continuously strengthen the research on the impact of extreme precipitation events on cities, improve the monitoring, forecasting and early warning service capacity, strengthen urban governance, and enhance the "resilience" of the city's defense against meteorological disasters. At the same time, actively promote the popularization of meteorological disaster science and continue to improve the awareness of the public in extreme disaster defense.