Abstract: In order to investigate variation characteristics of extreme drought and wet events in Shihezi Region,annual and monthly surface humid indexes and the frequency of extreme drought and wet events were analyzed based on the daily data of the 4 meteorological stations in Shihezi Region from 1961 to 2012. The results showed that frequency of the overall trend of extreme drought events was decreasing from 1961 to 2012 with the rate of -0.45 times/10 a, while the frequency of the overall trend of extreme wet events was increasing in the same time range with the rate of 0.39 times/10 a. The frequency of extreme drought events in summer half year and winter half year presented a downward trend with the rate of -0.20 times/10 a, -0.25 times/10 a, respectively. Whereas, an increasing trend was obvious for the variation of the frequency of extreme wet events in summer half year and winter half year (0.11 times/10 a, 0.12 times/10 a). The abrupt change of the frequency of annual extreme drought and wet events happened in 1986 and 1967, respectively. The frequency of extreme drought events had a main cycle of 12-13 years and a second cycle of 2-3 years. However, the frequency of extreme wet events showed no obvious large scale time periods, but presented a small cycle of 6-8 years. The decreasing trend of extreme drought events and the increasing trend of extreme wet events indicated a significant humidification trend in Shihezi Region.