Using the day by day precipitation data at 8 stations in Jianghan Plain from 1958 to 2004, the climatic change characteristics of yearly precipitation in Jianghan Plain in four seasons were analyzed. The results indicated that the annual rainfall trend in most parts of Jianghan Plain illustrated as the obvious straight trend and rainfall trend was 5.7-78. 9mm/10a. It was discovered that the trend of mean annual rainfall of Jianghan Plain was increase during the 47 years, and annual rainfall rose up with an increase of 39. 9mm/10a, especially since the 1990s. The rainfall increased during summe...