Combining the monthly precipitation data of four weather stations from 1960 to 2011 in Aksu River Basin ,the paper divided dry and wet levels by Z index and analyzed the dry wet trend and dry wet cycle regularity in different time scales (annual,quarterly,monthly) by using the MK non parametric test, apportionment entropy and Morlet wavelet method. The results show that in the 1990s,there was a process from dry to wet; on monthly scale, Z index of each station is not significant upward trend in general; on quarter scale, Z index in autumn shows a significant upward trend, the value of U passes the significance test of 95%; on annual scale, Z index of each station shows a trend of significant increase; there are about 5 years dry wet cycles and 14 years interannual dry wet cycles in Aksu river basin.