Abstract: Based on the synchronous observation data of air temperature, relative humidity, wind speed and air pressure on the high and low points of high sand ridges in the hinterland of Taklimakan Desert from October 8, 2018 to January 31, 2019. We compared and analyzed the micrometeorological characteristics of autumn and winter on the undulating terrain of desert.The results show that the variation of topography caused by the high sand ridges makes the diurnal variation of air temperature, specific humidity and wind speed obvious between the high point of the sand ridge and the low point of the sand ridge in the hinterland of the Taklimakan Desert. The temperature of sand ridge high point and sand ridge low point difference is mainly related to the phenomenon of temperature inversion at night in the hinterland of desert,which shows that the temperature at the sand ridge high point is obviously higher than that of the sand ridge low point, and the average temperature difference during the observation period is 6.6 ℃.The daily range of temperature the low point of the sand ridge is higher than the high point of the sand ridge.In October, November and December 2018 the inversion phenomenon of air temperature with height corresponds to the time when the temperature at the high point of the sand ridge is higher than that at the low point of the sand ridge. The specific humidity of the two sites was smaller, and the average specific humidity was 0.68 g·kg^-1 and 0.99 g·kg^-1 respectively. The diurnal variation trend of specific humidity varies significantly with the season, which is mainly related to the increase of atmospheric stability, the increase of water vapor in winter and the phenomenon of reverse humidity at night. The wind speed at the high point of the sand ridge with higher terrain position is larger than that at the low point of the sand ridge, and the difference of wind speed is mainly reflected in the night. The wind speed was maintained between 1.9 and 4.6 m·s^-1 at the high point of the sand ridge, with an average wind speed of 3.2 m·s^-1. The low point wind speed of sand ridge is between 0.8 and 4.5 m·s^-1, and the average wind speed is 2.5 m·s^-1 on November 2, 14, 15, 20 and January 30, 2018.

Key words: fluctuated surface, tall sand ridge, micrometeorology, Taklimakan Desert