The structure of the gas distributor was optimized to enhance the reaction rate of direct synthesis of silicone monomers in a fluidized bed. In this work, the opening rate range was selected by the critical pressure drop ratio, and the influences of opening ratio and the holes quantities of distribution plate on the synthesis process were systematically studied by numerical simulation approaches. The fluidization velocity was simplified by Reylows’ and Archimedes’ criterion numbers. To better predict the gas-solid fluidization characteristics in the bed, the drag model was modified by the critical fluidization velocity. In addition, the distributor performance was investigated from the perspectives of solid phase volume fraction, pressure drop change, bubble behavior and power spectrum analysis, etc. The results show that the distribution plate pressure drop ratio is about 0.11679 at the opening rate of 0.53%, which meets the design criterion of reducing the dissipation while increasing the fluidized quality. A high frequency and a low amplitude arise at the opening rate of 0.53%, indicating the corresponding favorable efficiency of heat and mass transfer. The maximum fluctuation range of the solid phase distribution with Ø=0.53% is only 1.7%, indicating that the inhomogeneity of the solid phase fraction distribution is the lowest, and the fluidization stability is improved by about 30%. Consequently, Ø=0.53% is proposed as the best distributor configuration and enhanced the monomer synthesis efficiency.