Abstract: Record of Late Glacial Age environmental and climatic change in the Ulungur area，Xinjiang，China is reconstructed from a sediment core at Ulungur Lake. The proxies used mainly include sediment grain size，organic matter content and sediment color. As is known to us，the sediment grain size and organic matter content are the normal proxies，and they are widely used in exploring the climate change. The experimental dates of these two proxies are from the Laboratory of West China’s Environmental System. The proxy of sediment color deserves to be mentioned，as it is initially used in deep-sea sediment research，as time goes，it is developed to Chinese loess research. But the proxy of sediment color was rarely used in lake sediment research. This paper tries to explore the significance and practicability of this proxy in indicating the climate change in lake sediment. The results show that the proxy of sediment color can compare well with the other proxies，and is sensitive to the climate change. In the aspect of chronology，radiocarbon dating is conducted using AMS¹⁴C and conventional ¹⁴C methods to date 10 samples，consisting of organic matter and charred material. Taking full account of the“reservoir effect”，this paper gets a series of relatively reliable chronological dates，which lays a foundation for the reconstructing of the past climate change of Ulungur area. Multi-proxy dates show that the effective moisture and lake level is a little higher during the late-glacial（12.3-11.2 cal ka BP），which is inferred from the higher organic matter content and smaller mean grain size； During the early Holocene （11.2-7.4 cal ka BP），the proxies have an character of large sediment grain size、low organic matter content and high sediment color a* and b*，which shows the climate was cold and dry，and lake level is low；During the period of 7.4-4.3 cal ka BP，the proxies indicates a warm and wet climate，and lake level is high；After 4.3 cal ka BP，the proxies are fluctuated in change，which indicates that the effective moisture and lake level are changed repeatedly. The climate change after late glacial period recorded by Ulungur10B is not only consistent with the records of other lake records around Ulungur area，but also has a good comparability with the records of central Asia lakes. As a result，this article gets the conclusion that the climate change in the area of Ulungur lake is consistent with regional climate background，and obeys the“arid Central Asian westerly mode”．

Key words: Ulungur Lake, Late Glacial Age, Holocene, westerly model