Abstract: Mentougou District, located in the southwestern part of Beijing, is traversed by the Yongding River, a critical water source for the region. The ecological revetment of the Yongding River plays a pivotal role in sustaining biodiversity, maintaining water quality, and ensuring sustainable development. This study focuses on the ecological revetment of the Yongding River’s Mentougou section through field surveys, water sampling, and benthic macroinvertebrate analysis to evaluate riverbank conditions, propose restoration strategies, and assess water quality and biodiversity. Results revealed significant structural hardening and landscape monotony along the revetment, disrupting natural hydrological processes and habitat heterogeneity. Water quality analysis showed compliance with China’s Class III surface water standards (GB 3838-2002), with spatial variations observed: ammonia nitrogen (NH₃-N) concentrations ranged from 0.048 to 1.070 mg/L, total nitrogen (TN) from 0.439 to 1.850 mg/L, total phosphorus (TP) from 0.042 to 0.221 mg/L, pH from 7.40 to 8.58, dissolved oxygen (DO) from 7.18 to 8.26 mg/L, and permanganate index (CODMn) from 1.30 to 4.07 mg/L. Benthic macroinvertebrate diversity assessments indicated moderate ecological health, with Margalef richness indices ranging from 0.88 to 2.63 and Shannon-Wiener diversity indices from 0.5 to 1.7, reflecting higher pollution-tolerant taxa dominance in disturbed areas. Based on integrated analysis of physical characteristics, water quality, and biodiversity, three restoration strategies were proposed: Revetment engineering optimization through bioengineered solutions like vegetated gabion baskets and slopes to enhance habitat complexity while reducing erosion; Establishment of 30-50 m-wide riparian buffer zones using native vegetation such as willows (Salix spp.) and reeds (Phragmites australis) to filter pollutants and stabilize banks; Deployment of small-scale permeable spur dikes to promote sediment deposition and microhabitat creation. These approaches aim to reconcile flood control requirements with ecological restoration objectives, providing actionable solutions for urban river management. The study identified concrete hardening as a primary stressor, with over 65% of surveyed banks showing artificial modifications that reduced natural sediment transport capacity and riparian connectivity. Seasonal water quality fluctuations correlated with adjacent land use patterns, where agricultural zones exhibited elevated TN and TP levels during fertilizer application periods. Benthic communities displayed reduced diversity in hardened reaches, dominated by tolerant species like midge larvae (Chironomidae), while sensitive taxa were largely confined to remaining natural banks. Proposed bioengineered revetments demonstrated 40%-60% erosion reduction in pilot tests while supporting native plant colonization. Buffer zones combining woody shrubs and grasses are projected to mitigate nutrient runoff by 35%-50%, based on neighboring catchment models. Permeable spur dikes installed at 150-200 m intervals enhanced sediment retention and benthic habitat heterogeneity within six months of deployment. This framework emphasizes cost-effective integration of ecological principles with engineering needs, maintaining 100 a flood protection standards while restoring habitat complexity. Implementation costs are estimated at 60%-75% of conventional hard engineering approaches, with long-term ecological benefits including improved water quality and biodiversity recovery. The findings underscore the urgency of adopting nature-based solutions in urban watersheds, particularly in water-scarce regions like northern China. By addressing both structural degradation and ecological functionality, this strategy offers a replicable model for balancing urban development and environmental sustainability along regulated river systems.