To better regulate and manage flood risk, the supply of ecosystem flood regulation service was evaluated through the SCS-CN model, and the demand of ecosystem flood regulation service was calculated as flood inundation amount through the FloodArea model in Lan County, Shanxi Province. Meanwhile, flood risk zoning was conducted by combining with population distribution. The results are as follows. 1) The supply mount of ecosystem flood regulation service of 5-year, 10-year and 25-year return period flood presented an increasing trend. However, the supply amount for the 10-year return period flood was lower than that for the 5-year by 33.05%, mainly due to the difference in soil moisture. 2) The demand amount of ecosystem flood regulation service of 5-year, 10-year and 25-year return period flood increased gradually. When one 5-year return period flood and one 10-year return period flood occurred consecutively, the flood risk arose principally from the increase in submerged depth. 3) The unbalanced supply-demand area of ecosystem flood regulation service of 10-year return period flood was far larger than those of 5-year and 25-year return period flood, which indicates that the ecosystem flood regulation service supply was not enough to cope with the situation of small and moderate flood occurred in succession. The unbalanced supply-demand area of 5-year and 25-year return period flood was affected principally by elevation and land use, while that of 10-year return period flood was influenced mainly by precipitation. 4) The high priority area of 5-year, 10-year and 25-year return period flood was distributed merely in Dongcun Town, whereas priority area and second-dary priority area were distributed in accordance with the unbalanced supply-demand area of ecosystem flood regulation service. The results can provide theoretical basis for ecosystem service management and flood risk management. 

为了更好地调节和管理洪水风险, 使用SCS-CN模型计算洪水调节服务供给量, 使用FloodArea模型模拟洪水淹没量表示洪水调节服务需求量, 评价山西省岚县5年一遇、10年一遇和25年一遇洪水调节服务的供需关系, 并结合人口分布进行风险管理分区, 得到如下结果。1) 5年、10年和25年一遇洪水调节服务供给量呈增加趋势, 10年一遇比5年一遇洪水调节服务供给量低33.05%, 主要源于土壤湿润状况不同。2) 5年一遇、10年一遇和25年一遇洪水调节服务需求量逐渐增加, 5年一遇和10年一遇洪水连续发生时, 风险主要来自淹没深度的增加。3) 10年一遇洪水调节服务供需不平衡面积远高于5年和25年一遇洪水, 表明生态系统洪水调节服务供给不足以应对小洪水和中洪水连续发生的情况; 5年一遇和25年一遇供需不平衡面积受海拔高度和土地利用的影响, 10年一遇供需不平衡面积受降雨量的显著影响。4) 5年、10年和25年一遇洪水调节服务强优先管理区仅分布于东村镇, 优先管理区和亚优先管理区分布与洪水调节服务供需不平衡区域基本一致。研究结果可为汾河上游生态系统服务管理和洪水风险管理提供理论依据。