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Density modulation experiments are successfully conducted on HT-7 ohmic discharge to investigate particle transport coefficients: diffusion coefficients D and convection velocity V. The particle transport is studied at low (1.5 × 1019 m-3) and high (3 × 1019 m-3) density regimes. The clear differences are observed that D is 0.42m2/s and 0.17m2/s, V is 4.7m/s (outward) and 1.6m/s (inward) for low and high density plasmas respectively, where spatially constant D and V(r) = (r/a) Vo were assumed for the analysis.