Abstract: In order to analyze the changing characteristics of field waterlogging,the Lixiahe Plain,Jiangsu Province after environmental changes,taking a typical polder in Gaoyou Irrigation District as an example,the waterlogging distribution and production reduction were simulated with a distributed model of field waterlogging under varying conditions of environmental factors,such as rainstorm intensity,bucket scale,efflux conditions,pumping capacity,and pumping station scheduling rules,etc.The results show that under current conditions,the area affected by waterlogging in the study area is10.47% when 5% rainstorm is encountered,with 4. 07% maximum yield reduction rate. However,when 2% and 1% rainstorms are encountered,the ratio of waterlogged area increases to 56.54% and86.87%,and the maximum yield reduction rate increases to 10.32% and 13.37%,respectively. If the depth of the bucket ditch is dug from 1.3 m to 2.0 m,the area affected by 5%,2%,and 1% rainstorm conditions can be reduced by 14.73%,16.11%,and 3.91%,and the maximum yield reduction rate can be reduced by 5.16%,4.75%,and 3.81%,respectively. If the water level of the outer river is pre-dropped by 0.5 m,the area affected by 5%,2%,and 1% rainstorm conditions can be reduced by86.87%,13. 62%,and 8.52%,and the maximum yield reduction rate can be reduced by 66.59%,40. 60%,and 28.12%,respectively. If the efflux capacity of the pumping station in the study area is increased from 9 m~3/s to 14 m~3/s,the situation remains unchanged when 5% rainstorm is encountered,while under 2% and 1% rainstorm conditions,the affected area can be reduced by 31.68% and11. 52%,and the maximum yield reduction rate can be reduced by 31.10% and 11.44%. Decreasing the drainage level of the pumping station without lowering the warning water level of the outer river has almost no impact on the flood mitigation effect.