Abstract: Based on historical data of waterlogging and yield data of soybean in the corresponding counties（cities） of 73 meteorological stations in Heilongjiang Province from 1984 to 2022, and growth period data of soybean of 27 agricultural meteorological stations, the sequences of yield reduction rate of soybean waterlogging samples were constructed by statistical grouping method. The methods of Kolmogorov-Smirnov test and confidence interval threshold were used, the grade indices of yield reduction rate of soybean waterlogging in Heilongjiang Province were established. The results showed that the lower limits of yield reduction rate in light, moderate and severe were 5.6%, 10.3% and 14.7% at the stages of seedling emergence and three true leaves, 6.2%, 9.3% and 14.2% at the stages of flowering and podding, respectively. The coincidence rate between the index evaluation results and the historical disaster records was 84%, which could be applied to the quantitative evaluation of impact of soybean waterlogging in Heilongjiang Province. The quantitative evaluation index of effects of soybean waterlogging at different growth stages in Heilongjiang Province is constructed, which is helpful to realize the quantitative evaluation of soybean waterlogging in Heilongjiang Province.