LOI 550 ℃ (loss on ignition at 550 ℃) and Ti, Al, Si, K intensities of the sediments from the Huguangyan Maar Lake were analyzed for reconstruction of the Holocene paleoenvironmental evolution. LOI mainly reflects the production changes within the drainage basin, whereas Ti, Si, K mainly depend upon the runoff input of the drainage basin. During the period of 11 000~7 800 cal.a B.P., the climate at the Huguangyan district was warm and wet. After 7 800 cal. a B.P., it quickly became dry and cold. Though there were a series of climatic fluctuations since 7 800 cal. a B.P., they were much weaker than those in the Early Holocene. Millennial-scale Holocene paleoenvironmental evolution recorded by the sediments of the