This paper presents a paleoenvironmental study on Hoya Rincon de Parangueo, a maar lake in Valle do Santiago in Central Mexican Bajio. Maar lake sediments have been widely used for high-resolution reconstruction of paleoenvironment. Many different paleoenvironmental proxy data such as stable isotopes, pollen, sediment chemistry, and dung fungus spore were produced in this study. The pine-oak ratio, stable isotopes, and sediment chemistry help to reveal paleoenviromental changes throughout the whole period covered by sediment materials from this study site. The evidence I found indicates that during $ca.9,500∼ca.8,300 $ cal yr B.P. there was dry climate; during $ca. 8,300 ∼ ca. 6,300 $ cal yr B.P it was wetter; during $ca. 6,300 ∼ ca. 4,000 $ cal yr B.P. drier and cooler; during $ca. 4,000 ∼ ca.1,100$ cal yr B.P. milder and wetter. The presence of Chupicuaro culture between $ca.2,500∼ca.1,100 $cal yr B.P is implied by the high frequencies of Amaranthaceae and Zea mays. It seems that man left this lake around 1,100 cal yr B.P. due to a dry climate after 1,300 cal yr B.P. Spanish arrival around 400 cal yr B.P. is implied by the fact that Zea mays reappears and Sporormiella spp. become significant around 120 cm, whereas Poaceae drops sharply.