The aim of this study was to optimize operating conditions to extract benzaldehyde, cinnamaldehyde, phenylpropyl aldehyde, cinnamyl acetate, and o-methoxy cinnamic aldehyde from cinnamon oil by steam distillation. A single factor experiment was conducted to investigate the influence of three main factors including particle size, temperature, and time on the yield and content of the ingredients. To explore the relationship between factors influencing yield and content of the ingredients, the operating conditions were further optimized using the orthogonal experiment with yield and content of cinnmaldehyde as criteria. The optimized parameters of the extracting processes were as follows: 20 mesh, temperature 168 oC, and time 1.5 h. It gave 2.08% yield and 91.50% content of cinnamaldehyde. The repeated experiments also indicated the same results were obtained with good quality on the base of optimized parameters.