According to the date of temperature and precipitation in the Tarim irrigation area from January,1961 to December 1999,the climate of the Tarim irrigation area is analysed.The results show that the precipitation of the Tarim irrigation area for 40 years appears to be ascending (4.569mm/10 a),the precipitation in autumn appears to be descending (-3 451mm/10 a) and the mean annual temperature appears to be going up (0.065℃/10 a), especially in the later 1990′s.The warming trend in winter is more than the cooling trend in summer.For this reason, in terms of the limit of the end of 1970′s the climate of the Tarim irrigation area for 40 years might be divided into two stages,the former is a cold period,and the latter is a warm period.