There have been 6 heavy floods occur in the Yangtze River since 1991 which are related with a shortage of flood retention lakes as well as global warming. The 1990's were the warmest period of the last 1000 years characterized by accelerated hydrological circulation. The summer precipitation that occurred in the middle and lower reaches of the Yangtze River was the largest in magnitude and quantity of the recent 120 years; about 112 mm more than that in 1961-1990. Convergent precipitation and rainstorm events are the main driving factors for increasing floods in the Yangtze River. Climate model researchers indicate that coupled CO₂ may lead to temperature increase of 2.2℃ and summer precipitation increase of 10%-20%. Based on the hypothetical scenarios that global warming may lead to an increase of latent evaporation of 9%-15%, the flood peak flow at Datong station will reach 84000 m³/s if the precipitation increases 10% and the evaporation increase 9%, exceeding that of 1998; the flood peak flow at Hankou station will reach 79000 m³/s, exceeding all recorded flood peak runoff; the flood peak flow at Yichang station will reach 69400 m³/s, exceeding the instrumental records, except 1896's and 1981's records. The third scenario, i.e. the maximum peak flow occurred when the precipitation increases 20% and the evaporation increases 15%, the flood runoff at Datong station will reach 94500 m³/s, exceeding the maximum value of last 100 years (namely 92600 m³/s in 1954). The Yichang station will have flood peak flow of 78200 m³/s, exceeding all the instrumental records since 1882, but less than the 105000 m³/s calculated based on flood trace of 1870. Persistent climate warming in the future will lead to increasing precipitation and which will put tremendous pressure on the controlling of the Yangtze floods.