The　Xiangjiaba　project　is　located　in　the　Shuifu　County,　Yunnan　Province.　It　is　situated　approximately　157　km　away　from　the　Xiluodu　project,　33　km　away　from　the　Yibin　City　and　1.5　km　away　from　the　Shuifu　County.　The　Area　C　landslide　of　Suijiang　County,　with　a　volume　of　47　million　m3,　is　located　on　the　southern　bank　of　the　Xiangjiaba　project.　The　landslide　body　has　been　experiencing　persistent　deformation　with　a　recorded　maximum　horizontal　displacement　of　1,480　mm　up　to　December　2015,　posing　a　critical　threat　to　the　lives　and　properties　of　local　residents.　Based　on　the　data　collected　from　detailed　geological　surveys　and　three-year　monitoring,　this　paper　presents　the　findings　of　an　in-depth　study　about　deformation　characteristics　and　influence　factors　of　Area　C　landslide.　The　findings　indicate　that:　the　high　southern　terrain,　steep　back　rock,　wavy-bedded　sandstone　and　mudstone　interbeds　and　hydrophilic　soil　provide　necessary　conditions　for　the　landslide.　The　Area　C　is　located　in　ancient　landslide　sites,　a　secondary　shear　exists　in　its　front.　During　the　rainy　season,　the　displacement　rate　of　Area　C　increased　sharply,　and　the　deformation　is　more　closely　associated　with　the　sudden　drop　of　reservoir　water　than　with　the　sudden　rise.　The　safety　factor　decreases　under　reservoir　inundation　and　rainfall.　Continuous　creep　contributes　to　the　movements　of　Area　C　landslide,　though　the　movements　are　slow.　The　possibility　of　high-speed　slip　is　very　small.　Relevant　measures　should　be　taken　to　protect　the　safety　of　lives　and　properties　of　the　immigrants.