Abstract : Using the data from surface automatic weather stations , weather radar products , and ECMWF reanalysis data , etc . , we conducted the research on the extreme rainstorm in North China from July 29 to August 1 , 2023 . This extreme rainstorm process featured large precipitation amount , long duration and significant topographic effect. The abnormal subtropical high pressure was overlapped with the Central Siberian high-pressure , forming a high-pressure dam and causing the typhoon low vortex circulation to have been lingering in North China for a long time . The coupling effect of the upper-and lower-level jet streams formed a suction effect , providing dynamic lifting conditions . The southeastern low-level jet between the double typhoons and the subtropical high brought abundant water vapor and unstable energy into North China. The low-level southeasterly airflow was forced to rise along the slopes at the eastern foot of the Taihang Mountains and the southern foot of the Yanshan Mountains , where an abnormal water vapor convergence center was formed in front of the mountains , maintaining stable . In a word , the combined influence of multiple factors such as the double typhoons , abnormal dynamic conditions , and the special terrain led to the occurrence of the extreme rainstorm in North China. The research conclusions can provide a reference for the analysis and forcast of heavy rainstorms in North China in the near future .