Abstract: The wire short circuit, urban pluvial flooding, and secondary disasters initiated by heavy rainfall cause huge loss of electric power system in Henan Province every year. Based on the daily precipitation data of 53 years and hourly precipitation data of 6 years, the statistical characteristics of precipitation in Henan Province are analyzed. In conjunction with social electricity consumption, electricity supply, per capita Gross Domestic Product (GDP), and high-resolution topography and river networks data, risk zoning of Power Grid disasters caused by rainstorm and short-duration heavy rain in Henan Province are studied. Results indicate the frequency of average annual rainstorm is 2.3 days. Of them, 75% rainstorms occur in summer. The frequency of rainstorm decreases gradually from south to north, from east to west in Henan Province. The rainstorm center is located in the Tongbai-Dabie mountain area. The frequency of short-duration heavy rain is the highest in July and August. The main centers of short-duration heavy rain are located in the Funiu Mountain area and the Tongbai-Dabie mountain area. The danger of disaster-causing factors (rainstorm and short-duration heavy rain), sensitivity of disaster-formative environments (topography and river networks), vulnerability of disaster-bearing body (electricity consumption and electricity supply) and ability of disaster prevention (per capita GDP) are comprehensively considered on the disaster risk zoning on Henan Power Grid. The key factors of risk zoning are the frequency of heavy rain and distribution of Power Grid. Rivers also have significant impacts on their surrounding areas. The four regions with the highest level of disaster risk zoning on Henan Power Grid are, Funiu Mountain area, the plain basin area of the Yellow River and the Hai River, the Shangqiu City area and the plain basin area of the Huai River. The first two areas have power plants, intensive UHV and EHV substations and transmission lines, and huge power consumption and supply in urban area, which require particular attentions.