Abstract: With EOF, REOF, wavelet analysis, the space-time characteristics of precipitation anomaly during the raining season in Hunan are studied by using the precipitation data from April to September during the period 1959-2001 from 19 observational stations. The results show: (1) The most typical pattern of precipitation is the dry-wet consistence. Other typical patterns show the dry-wet difference, for example, wet (or dry) in north and dry (or wet) in south partem , wet (or dry) in center and dry (or wet) in circumference pattern. (2) The first six rotated loading vector fields represent six principal precipitation anomaly areas: North Hunan, Middle part of Hunan, South Hunan, Southeast Hunan, West Hunan, Northeast Hunan. (3) By using the wavelet analysis on the periodicity and the mutation of precipitation during the raining season in Hunan, we find that there are 3-year, 7-year and 23-year time scales and main periods of precipitation during the raining season, and the precipitation during the raining season in Hunan will decrease gradually and switch to a dry period in the near future.