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Edge plasma parameters, including electron temperature Te, density ne, plasma potential φp, radial electric field Er and the corresponding fluctuations in the Sino- United Spherical Tokamak, have been systematically measured with Langmuir probe arrays. Wavenumber spectrum analyses show that edge fluctuations have a radial propagation character of the drift wave turbulence, with a characteristic radial phase velocity νphr ～ 0.7 km.s-1in the scrape-off layer and vphr ～ 0.9-1.4kms-1 in the plasma edge.