During the Holocene altithermal period, lake sediment developed extensively in the east part of China, and lake area expanded.Higher lake level was recorded in the west part, confirming that the heat and moisture conditions were improved to a certain extent.It is predicted that the reappearance of Such natural environments as those occurring at Holocene altithermal period due to the doubling of CO₂ concentration in the atomosphere will generally be favourable to improving industrial and agricultural conditions and raising environmental quality although the flood disasters in the east plain may be aggravated in the future.