How to uniformly distribute the liquid-solid two-phase flow is a difficulty which restricts the development of the liquid-solid fluidized bed.An Eulerian multiphase model incorporating the kinetic theory for solid particles was used to simulate the liquid-solid two-phase flow.The hydrodynamics in the lower vessel in a two-dimensional liquid-solid fluidized bed heat exchanger was simulated with the CFD method.The structural parameters of the liquid-solid distributor was optimized by simulation methods.The simulation results were in relatively good agreement with the experiments.The results indicated that when the angle of the V baffle was less than slide angle，the hole ratio of perforated plate was about 35% and the hole diameter was about 12 mm，the unevenness of solids volume fraction in the lower vessel was the least.