Southeastern Tibet is characterized by widespread glacial geomorphology, thus reflecting the dominating role of glaciation in the formation of geological process. However, it remains still unclear with regard to how the sediments respond continuously to the late Quaternary glaciation in this area. A continuous late Pleistocene sedimentary sequence, well exposed at the Ranwu lake area, includes stratified slope deposits, channel deposits, moraine deposits, and loess deposits from bottom to top. Here we firstly analyzed the sedimentary characteristics of this section using sedimentology, paleocurrent data, and conglomerate clast count. Secondly, we obtained the ages of this section through optically stimulated luminescence (OSL) dating. Lastly, we discussed the forming mechanisms of these four types of sediments. Preliminary results are as below: 1) Stratified slope deposits are composed of sands and gravels that exhibit a typical rhythmic layering and were formed at about 33 ka. They reflect the alternating cold and warm climate change and likely belong to a periglacial sediment which are mainly dominated by the combined gelifraction and freeze-thaw processes. 2) Channel deposits consist primarily of variably sized gravels with distinct imbrication and were formed at 32.8~25.1 ka. They were likely produced by the large-scale floods from the northeast due to glacial lake outburst floods. 3) Moraine deposits are composed primarily of poorly sorted gravels, sands, and silts and were occurred at 25.1~11.1 ka, indicating that the Ranwu Lake area was dominated by the glacier flow during the Last Glacial Maximum (LGM). 4) Loess deposits are comprised mainly of fine-grained sands and silts and were deposited during the interglacial period (11.1 ka). They are derived from glacial meltwater debris distributed in the valley which were subsequently transported by glacial wind. In brief, the stratified slope deposits and channel deposits from the lower part of this section were both developed during the interglacial of the Last Glacial Period (the weak warm period of late Marine Oxygen Isotope Stage 3, MIS 3a), while the moraine and loess deposits were formed during the LGM and the Younger Dryas (YD), respectively. This late Pleistocene sedimentary sequence in the Ranwu Lake area well reflects the influence of glaciers variations on sedimentation.