Eddy covariance method is the way to calculate directly the turbulence flux using the observed turbulence data, and is the best method to observe the surface flux, but it is not used correctly or correct, the errors and uncertainty of flux data is bigger. The observed turbulence data at Maqu station was used to calculate the flux by using the methods of quality control and quality assessment. The results show that: There is small errors for sensible heat flux between double rotation and triple rotation, latent heat flux using triple rotation is discrete than using double rotation and obviously, the double rotation method is reasonable; The difference is about 10 W·m-2 by using Schotanus virtual temperature correcting method, which is about 10 percent of sensible heat flux. The latent heat flux of WPL correction and LIU correction is important, the correcting term is about 6 percent and there is not big difference for two correcting methods.
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