Abstract: Tritiated styrene plays an important role in the organic tritium lights, which could be made by selective hydrogenation of phenylacetylene. A simulated reaction of the preparation of tritiated styrene was studied by using deuterium instead of tritium and using the Lindlar catalyst instead of Pd/C catalyst to improve the conversion and selectivity of the reaction. Experiment results showed that stirring speed, temperature and the amount of deuterium were the most important factors to effect the conversion and selectivity of the reaction. The relative stronger stirring speed and higher temperature could improve the conversion rate of the reaction, but could not change the selectivity. When the excessive or less deuterium was added in the reaction, the selectivity was decreased significantly, since the over deuterium promoted the reaction toward ethylbenzene. Lindlar catalyst exhibited higher selectivity toward styrene than Pd/C.