Abstract: The large-scale circulation background and the dynamic, thermal, and water vapor conditions of the heavy rainstorm in Hebei Province from 29 Jul to 2 Aug 2023 were analyzed using conventional observation data, ERA5 reanalysis data, and Black Body Temperature (TBB) obtained from Satellite FY-4G. The results show that the subtropical high and continental high were connected during the rainstorm, forming a quasi-east–west “high-pressure barrier” in the north of Hebei Province. Typhoon Doksuri weakened to a low-level cyclone after landing, and under the guidance of the western flow of the subtropical high, it moved northward and stalled in Shanxi Province due to the“high-pressure barrier”, forming a favorable circulation background of high east and low west over the rainstorm area. The evolution of a mesoscale convective system involved during heavy rainstorms has complex characteristics, with widespread spiral rain bands, concentrated vigorous convection, and scattered convective clouds successively, significantly impacting the maintenance of heavy rainfall. The precipitation fallout zone corresponds well with the center of the TBB low value. The widespread center of moisture convergence in the low levels during heavy rainfall, combined with adequate moisture conditions, played a crucial role. The influence of the vortex inverted trough, warm shear, and the south–easterly low-level jets provided strong updrafts for the rainstorms, and the blocking effect of the Taihang Mountains on the involved water vapor and air currents intensified the precipitation.