By using of the 42 a(1959—2000) monthly precipitation data at 80 sites in the Changjiang-Huaihe River valley,the temporal characteristics of Mei-yu precipitation anomalies and its related SSTA as well as its possible mechanism are investigated.It is found that the anomalies of Mei-yu precipitation in the Changjiang-Huaihe River valley exhibit an up-trend unusually,having significant interannual and interdecadal change characteristics.By filter analysis,the relationship between anomalous precipitation of different time scales and the corresponding anomaly of SST is analyed.It is found that SSTA exerts a multi-time scale infuence on Jiang-Huai Mei-yu and its precipitation anomalies as well.