Variation of wind profile and sand flow structure are the most visualized manifest in sand blown geomorphology under coupling of saltatory sand and wind field. Based on observation of wind profile and sand flow structure above a barchan dune in the Taklimakan Desert and comparison with those over a reference point (the flat ground between the longitudinal dunes), the researchers found some variations of the wind profile and the wind-sand flow structure. Affected by perturbation of dune landform, the wind profiles above dune slip face and two horns' nose are all manifested as non-logarithmic function form. Except for the foot of stoss slope, the sand flow structure above all other positions of the barchan dune are different to that over the reference point. Curve functions are fitted for the sand flow structures, and the segmental fitting is especialy used to fit those sand flow structure having segmental phenomenon.

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