Spatial-temporal analysis of precipitation at the middle or lower reaches of the Yangtze River near half century

By using the daily precipitation data of 89 stations in the middle and lower reaches of Yangtze River during the 1958～2009,by means of EOF,REOF,and wavelet analysis method,anglicizing the spatial distribution characteristics of precipitation and time scale of complex structure analysis.The results show that the middle and lower reaches of Yangtze river precipitation mainly have three typical space types and six typical sensitive regions on rainfall change.And all regions have six-year cycle.