annual trend
2.Regarded the Hotan River valley as water resource representative in Hotan area, based on the data of 500～300hPa upper air temperature and 0℃ level height at Hotan meteorological station in summer, and aestival runoff volume at Uluwati and Tongguziluokezi station located in upriver areas of the Hotan River from 1961 to 2004, analyzes their linear annual change trend.
4.The annual precipitation has a fluctuation change trend, the precipitation increases obviously in winter, the summer precipitation and the annual precipitation increase slowly, in each age the maximum precipitation in winter, summer, autumn and the maximum annual precipitation all appear at the beginning of 21st century in which the air temperature is warmer, the climate has a change trend from dry and warm to wet and warm.
5.The resuts showed that the annual average temperature had an increasing trend; summer, autumn and winter average temperature also had an increasing trend and the amplitude in winter was bigger; the change of standard deviation and coefficient of variation were acute during winter; the coefficients was bigger; the change of standard deviation and coefficient of variation were acute during winter; the coefficients of skewness were positive value during summer and autumn; the kurtosis coefficients were bigger during winter.
