Methylphenyldichlorosilane was synthesized using methyldichlorosilane and chlorobenzene as raw materials and chloroform as the catalyst by an adaptation of the gas phase catalytic condensation method. The reaction yield and selectivity were measured by gas chromatography. The influences of the temperature, pressure and space time on the yield and selectivity were studied. The optimal reaction conditions were: temperature = 600℃, pressure > 0.5MPa, and space time = 32.2s ~ 70.4s. The highest product yield and selectivity were, respectively, 32.8% and 34.3%, which were obtained with the reaction condition of 0.56wt% CHCl3, 600 ℃, 0.7MPa and 56.3s space time.