Numerous　damming　landslides　have　occurred　at　the　southeastern　margin　of　the　Tibetan　Plateau　due　to　intense　tectonic　activities,　strong　river　erosion,　and　extreme　climate　change.　A　Late　Pleistocene　paleo-landslide　damming　event　has　been　detected　in　the　Induba　area　in　the　upstream　reaches　of　the　Jinsha　River,　preserving　various　riverblocking　phenomena,　such　as　landslide　dammed　deposits　and　fluvial　and　paleo-dammed　lacustrine　sediments.　Based　on　remote　sensing　and　field　investigations,　we　determined　that　the　damming　landslide　originated　from　the　inclined　counter　rock　mass　and　experienced　intense　fragmentation,　forming　rock　avalanches,　which　were　possibly　triggered　by　paleo-earthquakes　or　a　combination　of　paleo-earthquakes　and　rainfall.　To　better　understand　the　evolution　of　dam　breaching　and　river　valley　landforms,　optically　stimulated　luminescence　(OSL)　dating　of　lacustrine　sediments　was　attempted.　The　results　show　that　the　landslide　damming　occurred　-79.30　ka　ago　and　formed　a　dammed　lake　upstream,　which　existed　at　least　-20.86　ka　before　the　dam　breaching.　The　horizontal　fluvial　layers　adhered　to　relict　landslide　deposits　on　the　left　bank,　indicating　that　the　process　of　dam　breaching　was　conducted　under　the　multiple　circulations　of　lake　water　overtopping,　fluvial　deposition,　and　river　undercutting.　This　study　enriches　our　understanding　of　the　formation　of　old　dammed　landslides　and　the　evolution　of　river　valley　landforms　in　this　region.