To scientifically assess the adaptability of flood control and water supply functions of the river network in the Haihe River Basin, spatial data analysis, spatial matching equilibrium indexes, and a coupling coordination model were used to quantify the adaptability pattern between river network functions and demands. Network robustness analysis was then applied to identify the key bottlenecks that constrain functional adaptability. Results indicate a significant spatial mismatch between the function and demand of flood control of the river network in the Haihe River Basin. High-value areas of flood control of the river network are concentrated in the western mountainous regions, while high-risk areas with flood control demand are primarily located in the eastern plains; water supply hotspots are spatially separated from irrigation demand areas. The adaptability of flood control and water supply functions of the river basin network faces dual bottlenecks of spatial imbalance and systemic discoordination, with poor spatial match of water supply function and the overall coupling coordination degree nearing breakdown. The adaptability pattern exhibits a distinct corridor effect, with the coupling coordination degree decreasing sharply from near-river areas toward the interior regions of the basin. The Hutuo and Wulie rivers, etc. are the controlling sections that restrict the functions of flood control and water supply. Keywords: river network functions; adaptability assessment; spatial autocorrelation; coupling coordination; Gini coefficient; the Haihe River Basin 〖FL