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Epigallocatechin gallate (EGCG) is the most abundant and active components in tea. In this text, the density and viscosity of ternary aqueous solution of EGCG containing LiCl/NaCl/KCl were determined at temperatures ranging from 288.15 to 308.15 K at atmospheric pressure. The density data was used to compute the apparent molar volumes (V φ ), limiting partial molar volumes (V φ 0 ), and transfer partial molar volumes (Δ trs V φ 0 ). The viscosity B-Coefficients were calculated from the measured viscosity data using the extended Jones−Dole equation. The values of density and viscosity increased continuously with the increasing of molality of EGCG and decreased with the temperature increasing. The positive values including (V φ , V φ 0 , Δ trs V φ 0 , viscosity B-Coefficients, the free energies of activation for solvent Δμ 1 0≠, and for solute Δμ 2 0≠) and Helper's constant (∂ 2 V φ 0 /∂T 2 ) p close to zero indicated the presence of strong solute−solvent interactions and the structure− making effect of EGCG in the investigated solutions. The apparent molar isobaric expansions (E φ 0 ) decreasing with temperature suggested that the solute−solvent interactions became weaker as temperature increased. These significant parameters could provide necessary data about molecular interactions occurring in simulated body fluids.