The obvious moistening fact in Central Xinjiang(CX) in recent 20 years was further analyzed utilizing the observed precipitation data at 15 stations in CX in 1951-2008 and partly hydro-meteorological data and the wavelet technique. The main conclusions are as follows: (1) Both the meteorological and hydrological data show that there exist three dry/wet episodes: i.e., gait wet one in 1946-1960, evident dry one in 1961-1986, and striking wet one in 1987-2007, in CX in the past 60 years. Each lasted 20 years or so, the rainfall in the last 20 years increase by 10%～20% than usual. (2) The moistening in recent 20 year is mainly occurring in summer. (3) The short period (quasi-three years) change for the precipitation in CX in past 60 years is quite clear; and the midrange-period change about 20 years is also clear especially in summer. (4) Judging from above moistening area is not on the whole Northwest China scale, the area precipitation had already decreased in the past three years, and also the precipitation climate projection in drought area has much more uncertain. It is possibly that above moistening is just the reflection about 20 year interdecaded change of Xinjiang precipitation.