Abstract: Using standardized precipitation index(SPI) as the indicator with which the characteristics of precipitation change was analyzed and based on 41 a meteorological data from 8 meteorological Observatories in Zoige and its surrounding areas,SPI value and the characteristics of its change during different time scales of year and month in these areas were calculated and analyzed. The result shows that,in recent 41 a,there was a steady decrease in precipitation in Zoige and its surrounding areas and the characteristics of precipitation change before and after 1990 were different. Before 1990,the precipitation was in a positive phase with clear interannual variation. After 1990,the precipitation was in a negative phase with weakening interannual variation. In Zoige wetland there was a clear interannual variation in monthly SPI and both ascending and descending of the linear trend,yet no trend has passed the 90% significance test. There was a steady trend for the 6 months of January,March,April,May,July,and August,an ascending trend for the 3 months of February,October,and November,and a descending trend for another 3 months of June,September,and December.