Abstract: The essential oil content was analyzed in the branches and leaves of Cinnamomum petropilum in different seasons,and comprehensive evaluation were made on the change of unit production of safrole in different seasons.The results showed that August to November was the best harvest season for the branches and leaves of Cinnamomum petropilum,however,the other season harvest would reduce its economic value,and was also not conducive to the sustainable development of Cinnamomum petrophilum industry as well.