The effects of different active metals, loads, carriers and reaction conditions on the competitive reaction of styrene oxide in catalytic hydrogenation system were studied. The catalytic systems of Pd/Al2O3、Ni/Al2O3、Pt/Al2O3、Pd/MgO-Al2O3 and Pd/AC were selected as the research objects. XRD, H2-TPD,BET,XPS and catalytic evaluation were used to investigate the correlation between catalysts and competitive reactions. It was found that in Pd catalysis system, higher reaction temperature can promote hydrogenation of oxidized styrene, but higher temperature is more favorable for isomerization into phenylacetaldehyde and further condensation reaction. When Pd0.5/MgO-Al2O3 is used as catalytic hydrogenation system and the reaction temperature is 100℃℃~200℃℃ , the conversion rate of oxidized styrene is greater than 95%, the selectivity of target product 2-phenylethanol is greater than 85%, and the selectivity of phenylacetaldehyde and its condensate is less than 15%.