The meteorological and lake water level data from Gangcha and Tianjun meteorological stations around the Qinghai Lake during 1958－2009 were used to analyze the air temperature，precipitation，drought index and geotemperature characteristics of Qinghai Lake watershed and their impacts on the lake water level．The results are as follows:(1)The midterm of the 1980s witnessed the climate change from warm－dry to warm－wet and it became warmer and wetter since 2000．(2)The ascending tendency of geotemperature was more remarkable than that of air temperature with 0．49－0．64℃rise per decade for 5－320 cm geotemperature and 0．27－0．31℃per decade(p＜0．01)for air temperature．(3)Geotemperature had more apparent linear relationship with water level of Qinhai Lake than air temperature，which Pearson correlation coefficient was－0．66－－0．8(p＜0．01)，and it became more significant with the increase of soil depth．(4)The current drought conditions affected the water level variation of the second year，and the effect of precipitation and temperature on the water level of the next year is greater than that of the current year．(5)Pearson correlation and regression analysis indicated that the change of winter temperature had a negative correlation with water level of Qinhai Lake in the next year(p＜0．01)，while the autumn precipitation had a significant positive correlation with water level in the next year(p＜0．01)．

Measurements of dew were carried out on four different soil surfaces ( biological soil crust, physical soil crust, bare sand and imp roved sandy soil) and different locationswithin a dune inMu us SandyLand in August 2007. Moreover, the p rocess of dew formation within a day was also observed. The results indicated that the characteristic of particle size was a determining factor for the dew amount for the different soil surfaces, the imp roved sandy soil had highest dew amount because it had a higher content of silt, and the dew amount of biological crust is significant higher than that of the bare dune sand. In general, dew begins at 17: 00 and ends at 7: 00,which correlated with the land surface temperature, the difference between air temperature and land surface temperture, net radiation on an hour time scale, and temperature daily range. The dew amount also changes with different locations of a dune, the dew amount in the top of the dune is least ( 0. 066 mm) , andmost (0. 100 mm) in foot slope of the dune, the resultmay relate to the sun radiation.