Color reflectance records of the sediment cores taking from the Hole BDQ0608 in a palaeo-lake in Keke Xili region were studied for palaeoenvironmental and palaeoclimatic changes. Although the results of dry and wet samples have similar trend along the sediment profile, their values are of distinct difference. The variation of a^* and b^* values is relatively small, whereas the difference of L^* reaches 22.48. The variations of L^* values are mainly related to the changes in contents of total organic carbon (TOC). The correlation between grain size and L^* suggests that sediment environment is certainly a factor to the storage and preservation of total organic carbon, and hence L^* values of sediments could be used as an environment indicator.