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Many lacustrine chronology records suffer front radiocarbon reservoir effects. A Continuous, accurate varve chronology, in conjunction with accelerator mass spectrometry (AMS) (14)C dating, was used to determine the age of lacustrine sediment and to quantify the past (14)C reservoir effect in Sugan Lake (China). Reservoir age varied from 4340 to 2590 yr due to (14)C-depleted water in the late Holocene. However, during the Little Ice Age (LIA), (14)C reservoir age was relatively stable. According to this study, (14)C reservoir age in the late Holocene may be driven by hydrological and climatic changes of this period. Therefore. special caution should be paid to tire correction of the (14)C reservoir effect by a unique (14)C reservoir age in paleoclimatic and paleolimnological study of northwest China.