Field observations were carried out over grasslands facing desertification in a semi-arid area in China, then the micrometeorology was examined in relation to dese r ifcation. Albedo changed with grass growth, which reflects the surface conditions, wind profile over the grass was logarithmic though over the dune a turbulent mixing layer which prevents plant growth was dominant. Evapotranspiration of the grassland ET was 2.8mm/day in early August, while it was less than 1mm/day in the dry season. Heat budget of the grassland facing desertification was close to that of the dune.
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