Rapid　and　long-runout　landslides　characterized　by　their　high　speed,　long　distance　mobility,　and　huge　capacity　and　volume　would　pose　significant　threats　to　infrastructure　and　life　safety.　In　this　study,　a　rapid　and　long-runout　landslide　that　occurred　in　the　Bingda　village　of　the　northeastern　Tibetan　Plateau,　which　was　triggered　by　heavy　rainfall　in　June　2017,　was　preliminarily　investigated.　On　the　basis　of　detailed　field　surveys,　high-resolution　satellite　imagery　analysis,　and　laboratory　tests,　the　morphological　and　sedimentological　features　of　the　landslide　were　described,　and　the　formation　mechanism　of　hummocky　landforms　and　its　insight　into　the　extraordinary　movement　of　the　Bingda　landslide　was　deduced.　The　field　investigation　and　satellite　imagery　analysis　showed　that　there　were　nearly　200　hummocks,　mostly　with　normal　circular　bases　and　with　a　height　of　similar　to　0.1　m-7.5　m,　distributed　in　the　transfer　and　accumulation　areas　of　the　landslide.　The　height　and　number　density　of　the　hummocks　decreased　away　from　the　transfer　area　to　the　accumulation　area　and　displayed　higher　heights　at　the　outer　bends　of　the　gully　channel　than　that　at　the　inner　bends　of　it.　The　characteristics　of　the　spatial　distribution　and　the　composition　of　hummocks　indicated　that　significant　generation　and　dissipation　of　pore-water　pressure　within　the　loose　and　saturated　silty　clay　layer　in　the　runout　path　was　the　most　probable　reason　for　the　formation　of　hummocky　landforms.　This　study　also　provided　insights　into　the　hypermobility　mechanisms　of　the　Bingda　landslide,　suggesting　that　this　landslide　began　with　the　sliding　failure　of　the　weathered　colluvium　in　the　source　area,　and　then　the　landslide　debris　traveled　into　the　channel　and　impacted　sudden　undrained　loading　and　rapid　shearing　to　the　underlying　silty　clay　layers　in　the　gully.　These　processes　generated　pore-water　pressure　and　reduced　the　effective　stress　within　the　soil　particles,　resulting　in　a　decrease　in　the　frictional　resistance　in　the　substrate,　finally　facilitating　the　rapid　and　long-runout　movement　of　the　landslide.