Abstract: It uses the method of linear tendency estimate，cumulative departure，t test and the M-K mutation test to analyze change trend and mutation feature of rainfall observation data in Wuhu from 1971-2015（45）.The result shows that:（1）The annual rainfall in Wuhu is increasing.（2）The rainfall mainly concentrated in the spring and summer.The rainfall in different seasons accounts for the annual rainfall of 27.5%（spring），42.9%（summer），16.7%（autumn）and 12.9%（winter）.（3）Spring，summer and winter rainfall change is typical multimodal model，and the autumn season is unimodal type.（4）Spring and winter rainfall appear mutation，summer，autumn and average don’t.The year of 2004 is the spring rainfall sequence reducing mutation point，and the year of 1988 is the winter rainfall sequence increasing mutation point.