[Objective] The formation mechanisms of clustered slope debris flows in Mentougou District, Beijing City, were analyzed in order to provide a theoretical basis for the prevention and control of this type of deloris flow. [Methods] A multi-source data fusion approach combined with field verification was adopted.① Maxar WorldView 0.3 m high-resolution remote sensing images were applied for the first time to identify the spatial distribution, flow paths, and depositional characteristics of the group-occurring slope debris flows.② UAV oblique photogrammetry was used to obtain high-precision topographic data of typical disaster sites. [Results] The group-occurring slope debris flows in Wangping Village resulted from the triple coupling of ‘geological environment basement-extreme rainfall-human engineering disturbance'. Geologically controlled by an anticline structure, with slope gradients ranging from 19.49° to 36.54°, the ‘dual structure' formed by residual-slope deposits and bedrock provided material sources and sliding boundaries for the debris flows. Extreme rainfall(cumulative rainfall >700 mm, maximum rainfall intensity of 111.8 mm/h) led to soil saturation and triggered the flows. Human engineering disturbances altered slope topography and reduced slope stability. The disasters were concentrated along the anticlinal axis, characterized by small scale, high group occurrence, and strong concealment. [Conclusion] An integrated model of ‘combining prevention and control, ecological-economic synergy' is proposed.① Flexible barriers are deployed in the material source initiation areas and upstream of protected objects(residential areas, railways), saving 70% of the investment compared to traditional reinforced concrete barrier dams.② The application of geocells combined with grass planting measures in erosional gullies saves 52% of costs compared to traditional stone masonry retaining walls and reduce soil loss by over 90%.