Abstract: Abstract Cinnamomum cassia Presi are all the cultivation varieties in the tropical and subtropical areas of Yunnan. Its are begining to blossom after planted four to six years. The bark cassia were cut after ten to fifteen years. The vegetative growth vary with varieties: Its grow rapidey during March to November, the grow slowly other monthes, and the flowering during May to June, the fruit ripening are from Februry to April every year. The essential oil content in the bark, the twig, the leavies, the froit of varieties with obvious variation, but chemical component not obvious variation after seven to sixteen years of varieties.

Key words: Cinnamomum cassia