Abstract: The preparation of modified cation resin supported platinum complex catalyst, and its catalytic properties for hydrosilylation reaction of styrene with methyl dichlorosilane were studied. Hydrosilylation reaction was carried out by using a fluid–phase flow reactor with the use of the catalyst prepared from easily available materials, cation resin, ethanolamine, and hexachloroplatinic acid. The catalyst displayed higher conversion activity, improved selectivity of β–addition products and enhanced thermal stability. The effects of temperature, the quantity of catalyst used, and reactant feed rate on hydrosilylation was discussed. At 70℃, when reactant feed rate was 6.7 mL/h and the quantity of catalyst was 2 g, the conversion of methyl dichlorosilane could reach 98.42% and the selectivity of β－addition products could be 99.23%. The reaction could be carried out for 21h without loss in catalytic activity.