Abstract: Current precipitation process and antecedent precipitation have important influences on spring corn waterlogging disaster, and therefore establishing level indicators of spring corn waterlogging disaster is of great scientific significance on real-time dynamic disaster monitoring, early warning and risk assessment. Analyzing the risk of spring corn waterlogging disaster provides technical support to regional preventing disasters and reducing damages, adjusting plantation structure, establishing agricultural insurance countermeasures, as well as business development, service and application of waterlogging disaster monitoring. It ensures national food security and guarantees sustained and steady development of agriculture production. Taking spring corn in Jianghan and west region of Jiangnan as research foci, data of different growth stages at 57 stations in the study area from 1961 to 2012 are investigated, which consist of daily precipitation data, spring corn growth period data and waterlogging disaster data. Current process precipitation and antecedent precipitation's influence on spring corn waterlogging disaster is quantitatively analyzed by using multivariate linear regression analysis, and hereby, "equivalent precipitation" is established. Based on normal distribution Lilliefors test and t-distribution interval estimation method, equivalent precipitation indicator thresholds of different waterlogging disaster levels during different growth stages are calculated. Then, spring corn waterlogging disaster level indicators during different growth stages are determined by thresholds, and verified by independent samples. On this basis, spring corn waterlogging disaster risk index of each station is calculated using risk assessment method based on information diffuse theory. Main results are as follows. First, in the study area, precipitation of current process and the first two ten-day have significant influence on spring corn waterlogging disaster with weight factors coefficients being 0.725, 0.171 and 0.104, respectively. Second, the equivalent precipitation indicator thresholds of spring corn waterlogging disaster of light, moderate and severe level are 56, 93 mm (without severe level) in seeding-jointing stage; 65, 104, 161 mm in jointing-tasseling stage; and 74, 115, 182 mm in tasseling-maturing stage. The spring corn waterlogging disaster level indicators can well reflect actual disaster situation, and there is high consistency between verification result and history record. Third, the risk of spring corn waterlogging disaster is relatively low during seeding-jointing stage and jointing-tasseling stage, by contrast tasseling-maturing stage is a high-risk period during which high-risk areas mainly include Enshi, southwest of Yichang, southwest of Jingzhou, and north of Zhangjiajie.