Meiyu refers to a special season of rainy weather that usually happens in early summer in China's Yangtze River region.The intensity,range and other characteristics of Meiyu precipitation,including trends of change,have important influences on the economic development,agricultural production,and lives of the people residing in this region.In recent years,an abnormal enhancement in rainstorm intensity,an increase in associated damage,and other atypical features have become more frequent.In other words,the Meiyu has begun to show new characteristics against the background of global warming.Choosing the moisture source during the Meiyu season as the starting point,the vapor transport characteristics over China's Yangtze River region were studied and discussed in this paper.The spatiotemporal characteristics of June-July Asian monsoon moisture transport and its relationship with precipitation over the Yangtze-Huaihe River Basin were investigated using ERA reanalysis data of wind and pressure,along with APHRODITE daily precipitation data for East Asia,over the period 1958-2007.Results showed that different moisture paths connected with different regional rainfall in the Yangtze-Huaihe River Basin.By calculating the water vapor flux intensity,three main water vapor paths that influence Meiyu precipitation in the Yangtze-Huaihe River Basin were partitioned out.The strongest transmission intensity belonged to the southwest path,but the greater contribution to Meiyu precipitation was from the South China Sea path and the southeast path.Meridional water vapor transport of the southwest path enhanced local precipitation in the western part of the Yangtze-Huaihe River Basin,while zonal transport reduced precipitation in the northern part;The influence of the South China Sea path on precipitation over the Yangtze-Huaihe River Basin featured reverse characteristics in the north and south.The precipitation in the area north of the basin was weakened by the direction of the meridional transport,while most areas south of the basin experienced an increase in precipitation.When water vapor transport was anomalously strong,there was less rain in the northern part of the basin and rain in the southeast;The zonal transport of the southeast path featured a significant increase in precipitation in the southwest and central to northern parts of the Yangtze-Huaihe River Basin.When the water vapor transport path was strong,a corresponding increase in precipitation in the central eastern Yangtze-Huaihe river basin was found.The characteristics of moisture transport during the Mei-yu season were found to exhibit interannual variation.Furthermore,precipitation intensity over the Yangtze-Huaihe River Basin was closely related to the strength of moisture transport.Using correlation analysis to identify the most significant areas of water vapor transport,nd combined with the synthesis of difference analysis of anomalous years of water vapor transport,he impact of water vapor transport intensity on the strength of Meiyu precipitation in the Yangtze-Huaihe River Basin was studied.The results of the correlation analysis and the synthesis of difference demonstrated that precipitation during the Mei-yu period over the Yangtze-Huaihe River Basin was mainly influenced by the southeast path of moisture transport,when the moisture transport derived from the West Pacific.The western Pacific Ocean contributed much more than the Indian Ocean in terms of vapor transfer into the Yangtze-Huaihe River Basin region.Against the background of global warming,the correlation and range of influence between the precipitation of the Meiyu season over the Yangtze-Huaihe River Basin and the intensity of the main water vapor transport sources has changed.The effect of western Pacific transportation into the Yangtze-Huaihe River Basin region on the enhancement of rainfall has weakened,while the scale of the decreased influence of Indian Ocean transportation on rainfall has significantly increased.Since the 1980s,the slowly increasing trend of precipitation over the Yangtze-Huaihe River Basin has been related to the moisture transportation anomalies caused by the easing of Asian circulation anomalies as a result of global warming.