Paleoenvironmental and paleoclimatic changes of the Nihewan Basin between 47 and 25 ka BP was analyzed using multiproxies such as pollen, grain size，carbonate, and δ18O and δ13C of ostracode shells from the Jing'erwa section of Nihewan Basin. The results show that the episode between 47 and 39 ka BP saw sparse vegetation cover and low precipitation, which suggests cold and dry climate. During the period between 47 and 39 ka BP, abundant forest vegetation and increasing amount of coarse sediment into the lake indicate that the precipitation was high at that time. Meanwhile, the mass reproduction of ostracode caused increasing content of carbonate and relatively negativeδ18O and δ13C values of ostracode shells, suggesting that lake water was warm with low salinity. The climate was wet and warm. The climate began to deteriorate since 30 ka BP. Lacustrine sedimentation terminated in 25 ka BP, which is probably attributed to cold and dry climate. In a word, the climate was warm and wet between 39 and 30 ka BP, which is generally consistent with the record from the Tibet Plateau and the Northwestern China.