The numerical simulations using MM5 model and diagnostic analysis are conducted for a heavy rainstorm event occurred on July 5-6, 2000 in Hebei province. The impacts of Taihang mountain on rainfall in Hebei province are discussed. The results show that the rainfall occurs at the eastern upwind direction of the Taihang mountain with obvious character of topography-induced heavy rainfall. The rainfall centers are consistent with the bell-mouthed topography. The finer terrain in the high resolving simulation is, the better the topography-induced heavy rainfall model forecast will be, the bigger the low-level eastern wind, and the more obvious precipitaion on upwind direction of the Taihang mountain. The flow shows local circumfluence character and all of the physical factors present wavy character along the terrain.