In recent years, the frequent occurrence of flood disasters has highlighted the contradiction between urban construction and the rainfall and flood safety system. To alleviate urban rainfall and flood disasters, promote the matching of supply and demand for rainfall and flood regulation services, and advance the high-quality development of urban and rural ecological spaces, a method for constructing a rainfall and flood safety pattern coupled with the theory of ecosystem service flows was proposed from the perspective of regulating service supply and demand.?Taking Tongcheng County, Hubei Province as a case study,the SCS-CN model and flood risk index were used to quantify the supply and demand of rainfall and flood regulation services, respectively. Hotspot and coldspot analyses were employed to identify ecological supply and demand source areas. Based on hydrological analysis and circuit theory, the flow paths of rainfall and flood regulation services were constructed, delineating blue-line corridors, green-line corridors, and supply-demand corridors, while key nodes in the network were identified.?The results show a significant spatial mismatch between the supply and demand of rainfall and flood regulation services in Tongcheng County, with a higher degree of imbalance in the central urban area. A total of 276.15km2 of supply source areas, 189.87km2 of demand source areas, 332.51km of blue-line corridors, 25.18km of green-line corridors, 34.02km of supply-demand corridors, and 100 key ecological nodes were identified. Accordingly, an optimization plan for the "Three Zones and Three Belts" rainfall and flood safety pattern was proposed, along with systematic regulatory strategies from three dimensions: supply space, demand space, and service flow space.