Abstract: The turbulent data observed in the Tamarisk scrub over Ejina oasis in the lower reaches of Heihe River from September 5 to 27, 2003 are used to investigate the relation between dimensionless turbulent speed variances and stability parameter Z/L. The results show that under the unstable stratified condition the stability parameter (Z/L) dependence of , , and can be fit to a power law with a power law index of 1/3, in accordance with the Monin-Obkuhov similarity theory. Under the near neutral condition, , / are slightly smaller/larger than their counterparts over the flat underlying surface. Under the convective condition, the stability parameter (Z/L) dependence of variances of dimensionless temperature and specific humidity fluctuations can be fitted to a power law with an index of -1/3, and under both the stable and unstable stratification the variance increases with the reduction of | Z/ L|. The sensible heat flux dominates the surface heat fluxes, with a peak value of about 250 W.m-2 for sensible heat and 170 W.m-2 for latent heat; and in night-time the latent heat flux is smaller, the sensible heat flux becomes negative. In day-time, the momentum flux ranges from 0.2 to 0.3 N.m-2 with a peak value of 0.31 N.m-2. The aerodynamic roughness length in the Ejina Tamarisk scrub is larger than those over the Gobi and other oasis underlying surfaces in the HEIFE, with =0.47551m under the neutral stratification. The bulk momentum transfer coefficient under the neutral, unstable, and stable stratification are 22.2×10-3, 10.3×10-3, and 7.2×10-3 and the corresponding values of the bulk heat transfer coefficient are 3.2×10-3, 3.3×10 -3,and 2.7×10 -3, respectively.