Abstract: Based on the eddy covariance flux data in Tazhong, middle part of the Taklimakan Desert, that collected in the autumn, October,2014, we analyzed the characteristics of land surface process flux variation. The result shows, the peak values of R_n, H, LE and G₀ are 273.0, 141.6, 5.0, 105.0 W·m^-2 respectively in October in Tazhong. The average daily total amount is 2.85, 2.68, 0.08, -0.57 MJ·m^-2 and the net radiation energy partitioning is dominated by sensible heat energy transfer. Under the different typical weather, the total amount of net radiation is variable in blowing-sand>sunny>cloudy>precipitation weather. H decreases with declining degrees of R_n during cloudy and blowing-sand weather, and the daily variation characteristics caused by the increase of latent heat in the precipitation weather are different from other weathers. The energy balance closure ratio is 79.0% in October, and it is changeable in cloudy>sunny>blowing-sand>precipitation weather, with 86.8%, 83.4%, 79.4%, 71.4% respectively. The surface albedo has a "U"-type change on sunny days. In cloudy and blowing-sand weather, the surface albedo trend slows down and fluctuates, and in precipitation weather it fluctuates first and then rises. The monthly average heat fluxes shows positive during the day and negative at night. The daytime energy balance closure ratio is 73.9%, and is only 50.8% during the night, so there is a higher energy that does not closed.

Key words: Taklimakan Desert, Tazhong, autumn, land surface processes