Step-like　landslides　have　been　attracting　more　and　more　attentions　because　of　their　displacement　with　step-like　characteristics.　At　present,　there　are　few　studies　about　the　mechanism　of　a　step-like　landslide　from　the　perspective　of　its　response　to　pore-water　pressure.　This　paper　considers　the　Yaoshan　landslide　disaster　mainly　affected　by　rainfall　and　groundwater　in　Anxi　County,　Quanzhou　City,　Fujian　Province,　as　an　example.　Based　on　an　in　situ　monitoring　test,　we　explored　the　infiltration　pathways　of　typhoons　and　rainstorms,　the　main　influencing　factors,　and　characteristics　of　pore-water　pressure　and　determined　the　relationship　between　landslide　displacement　and　pore-water　pressure　in　the　study　area.　The　results　show　the　following:　(1)　the　pore-water　pressure　within　the　slope　varies　with　fluctuation　in　groundwater　level　which　is　influenced　by　vertical　infiltration　of　rainwater　through　the　slope　surface　and　dominant　channels　in　the　study　area.　(2)　The　landslide　exactly　produces　a　step-like　displacement　when　the　pore-water　pressure　near　the　slip　surface　increases　from　the　minimum　point　to　the　maximum　and　then　dissipates　to　the　vicinity　of　the　starting　point.　(3)　The　correlation　between　pore-water　pressure　change　and　landslide　displacement　is　revealed,　and　the　empirical　formula　that　can　characterize　slope　displacement　generated　by　increment　in　per　unit　of　pore-water　pressure　in　unit　time　has　been　proposed.　This　study　is　crucial　as　it　offers　important　theoretical　and　practical　significance　for　the　analysis　of　disaster-causing　mechanism　and　monitoring　and　early　warning　of　the　same　type　of　landslide.