Based on the daily precipitation data of 16 selected meteorological stations over 1960-2010 in Sichuan Basin

this papaer analyzed the spatio-temporal distribution characteristics of annual mean precipita-tion days and different levels precipitation days by applying multiple analysis methods. The results indicated as follows. (1) The precipitation days occurring in Sichuan Basin showed a decreasing tendency

which star-ted since the 1990s and continued to now. (2) The decreasing of precipitation days of Sichuan Basin was a mutation phenomenon

which began from 1994. (3) The distribution of the annual mean precipitation days mainly showed that the more in west and south

while the less in east and north. (4) The precipitation days in west and north area of Sichuan Basin decreased rapidly. This decreasing tendency might be a result from the global warming. The regional distribution of precipitation days changed a lot with different levels. The increasing tendency of rainstorm days in northeast made more possibilities of geological disasters compared than ever before.