Magui River watershed in Gaozhou city of west Guangdong Province is selected as the study area.The main factors influencing collapse and landslide disasters and their weights were determined by Principal Component Analysis method, and the susceptibility zoning of collapse and landslide disasters under the coupling influence of the main factors was obtained.The results show: ① slope, watershed, stratum lithology, road buffer group and elevation are the main influential factors and their cumulative contribution rate are larger than 80%;② the slope larger than 30°, the drainage buffer group with interval of 200 m and 800 m, Quaternary, Jurassic and Late Proterozoic strata, road buffer group smaller than 2000 m and the elevation between 300 m and 700 m are the high sensitivity intervals of the five main factors respectively;③ highly-prone zones are mainly located in Magui town, Shenshui village, Sanjia village and Liutang village where residents are widely distributed and the disaster is serious, so disaster mitigation such as group monitoring and professional monitoring should be established.Determination of the main factors, their high sensitivity intervals and susceptibility zones have great engineering significance for guiding local residents' living and production, economic construction layout and disaster mitigation.%以粤西高州市马贵河流域为靶区,通过主成分分析法确定了影响崩塌滑坡灾害的主因子及其权重,得到主因子耦合作用下崩塌滑坡灾害的易发性分区.结果表明:① 坡度、水系、地层岩性、公路和高程为影响崩塌滑坡灾害的主因子,累计贡献率>80%;② ≥30°坡度区间,200~800 m水系距离,第四纪、侏罗纪和晚元古代地层,≤2 000 m公路距离,300~700 m高程区间分别为5大主因子的高敏感性区间;③ 高易发区域主要分布在马贵镇、深水村、三家村和六塘村,居民点分布广、灾害严重.建议加强群测群防和专业监测,做好防灾减灾工作.确定研究区崩塌滑坡灾害的主控因子、高敏感性区间和易发性分区,可以指导当地居民的生产生活、经济建设布局和防灾减灾,具有重要的工程实际意义.
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