Based on U/Th dates and 205 oxygen isotopic dates a record of the Asian Summer Monsoon (ASM) on millennial time scales was established during the Antepenultimate Glacial MIS8-MIS9 from stalagmite LM-1 in Laomu Cave from southeast of the Loess Plateau, the west of Henan Province, China. The minimum δ18O value of stalagmite LM-1 is-11.38‰, the maximum value is -6.99‰ and the vibration amplitude reach -4.37‰, mean -9.07‰, and showed this area was strongly affected by the Asian Monsoon system during the Antepenultimate Glacial. The δ18O record of stalagmite LM-1 is similar to that of the stalagmite LZ-15 of Linzhu Cave in Shennongjia, Hubei Province, China. So we can infer from that the content of CO2, CH4 and NO2 changing may amplify the climate fluctuation caused by the orbit driven.