Based on the hourly precipitation observation data of 156 meteorological stations in Beijing-Tianjin-Hebei region during the warm season (from May to September) from 2007 to 2017, this paper divides the study area into six zones according to the topography, and analyzes the intra-seasonal and diurnal variation characteristics of precipitation in each zone. The results are listed as below. 1) The rainy areas in Beijing-Tianjin-Hebei region are mainly located along the southern foot of Yanshan Mountains to Taihang Mountains with multiple rain field centers. 2) The intra-seasonal characteristics of precipitation in each zone are generally single-peak type, that is, the precipitation in July is the most, followed by the precipitation in August, and the minimum is in May. The main flood season is from the third pentad in July to the fourth pentad in August. 3) In general, precipitation in the nighttime is more rain that in the daytime. During the early flood season, the precipitation before early July mostly occurs between 16:00 and 21:00; during the main flood season, the precipitation presents a double-peak type with the peak value appearing between 17:00 and 22:00 and the secondary peak value appearing between 00:00 and 07:00; the later flood season after middle August is characterized by more precipitation in the nighttime with the peak value appearing between 00:00 and 08:00. 4) The short-duration precipitation mostly occurs in plateau mountainous areas and the long-duration accumulated precipitation contributes much to the seasonal precipitation in plain areas, while the persistent precipitation contributes much to Taihang Mountains and the west of windward slope of Yanshan Mountains.