Abstract: The chinese portion of the Tianshan Mountains divide Xinjiang into 1wo obviously different regions. Among the mountain ranges there are several basins differs not only in their arca but also in elevation. Strong sloar radiation, dry air and sparsely received rainfall is the main feature of climate in whole Xinjang.
The climate north and south of Tianshan Mountains is mainly characterized by：precipitation in norah slopes obvionsly greater than that in south slopes；west part greater than in east part；mountain areas greater than in plains and intermountain basins；windward slopes greater than in leeward slopes. The mean annual precipitation in mountain areas may reach 500 mm or above, while in Tuokexun that is only 6.9 mm.
Temperature in south slopes is higher than that in north slopes. In basins, the accumulative temperature of larger or equad 10℃ may reach 500℃／year, annual solar radiation from 5440-6590MJ/m², sunshine time may reach 3500 hours／year. Consequently, the substantial different climate Conditions north and south of Tianshan Mountain form the so called “humid island”, “stove” and “cold lake” areas in Xinjiang.