Carbonyl oxides(zwitterion) are the most reactive intermediates in ozonolysis reaction. This paper describes the trapping carbonyl oxides by amines or H2O. The direct ozonolytic conversion of styrene to benzaldehyde without the intermediacy of 1,2,4-trioxolanes(ozonides) and traditional reduction decomposition. The effect of the type of solvent, amount of solvent, reaction temperature, the flow of ozone and the kind of additive were investigated. The results show that H2O gives better reactivity than amines, different amines reactivity decreased in the order:Et3N>Bu3N>(C8H7)3N, tertiary amine>secondary amine. The appropriate reaction conditions are as follows (based on 0.05 mol styrene): 25.0 mL acetone as solvent, reaction temperature 0～5℃, the flow of ozone 200 mL•min-1, n(H2O):n(styrene)=3:1. Under above conditions, the average yield of benzaldehyde is about 96.5%.