Abstract: Based on observational data at 6 automatic meteorological stations which were set up between Cangshan Mountains and Erhai Lake area in the southeastern margin of Tibetan Plateau, three dimensional variation characteristics of wind speed, wind direction, air temperature, relative humidity and atmospheric pressure were analyzed for the period from January 2012 to December 2014. The results show as follows: 1) The diurnal variation of wind speed at different elevations displayed as one peak, and it is inf l uenced greatly by The altitude and terrain. The local of easterly and westerly wind cycle appears under 2640.0 m above sea level. There are diurnal variations of east-west and north-south wind components between 1990.5 m and 2640.0 m above sea level. 2) The diurnal variation of air temperature showed single valley with the minimum value before sunrise, and single peak with the maximum value in afternoon and before sunset. 3) The diurnal variation of relative humidity showed one peak with the maximum around 22:00 and one valley with the minimum around 11:00 at higher than 3520.0 m above sea level, while one peak with the maximum between 07:00 and 08:00 and one valley with the minimum at 15:00 to 17:00 between 1975.4 m and 2640.0 m above sea level. 4) The diurnal variation of atmospheric pressure showed double-peak with its fi rst and second peak values before noon and midnight respectively, while double-valleys with its fi rst and second valley values before sunrise and sunset respectively. The causes of diurnal variation of meteorological elements were related to terrain environment, land and lake distribution, solar radiation and so forth. These provide important basic knowledge on the atmospheric structure, the landatmosphere exchange, and the local atmospheric circulation's variation around the Tibetan Plateau.