Using the experimental data that came from the instrument parallel comparison in Gulang HeterogeneousUnderlying Surface Layer Experiment, the consistency of friction velocity and sensible heat flux observed by four sets of EC (Eddy Covariance System) which equidistantly lay on light path line of LAS (LargeAperture Scintillometer) was analyzed at first, and then the difference among the calculated regional sensible heat fluxs observed by LAS based on universal stability functions established by four different kinds of underlying surface employing the mean value of observationfriction velocity from four sets of EC was analyzed, finally a further comparison between the two observationsof LAS and EC was made. The results show that, friction velocity and sensible heat flux observed by four sets of EC have a good trend of consistency; the difference of friction velocity is less than 10%, and the difference of sensible heat flux is about 10%. The regional sensible heat flux of LAS calculated by four kinds of universal stability functions in the daytime and nighttime have identical changing trend with the average observed by EC, the calculated value is usuallybigger than normal, the calculated value of TAG universal stability function is closer to the average value observed by EC. Except for the main reason that universal stability functions from experiments of different underlying surfacehave some differences, the sensible heat flux observed by Kipp&Zonen LAS is systemic higher can not be ignored too.
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