Flow properties in a liquid-solid fluidized bed were simulated by means of an Euler-Euler two-fluid model.A k -ε turbulent model was used to simulate the flow behavior of liquid by considering the couplings between liquid and solid phases.The effect of liquid properties of density and viscosity upon flow properties was studied in the liquid-solid fluidized bed.Results show that the mixing of liquid and particles is uniform in the liquid-solid fluidized bed,and it exhibits a homogenous fluidization.The axial velocities of particles increase with the increase of liquid density and viscosity,and they both have the same trends in the bed.The simulation result of bed’s expanding heights is in an agreement with the calculation results of Babu et al..