Abstract: The contents of essential oils, methyleugenol and safrole in the root system and aerial part of six-y ear-old cultiv ated Asarum heterotropoides var.mandshuricum were determined in different development period.The result showed that the essential oils existed mainly in root system.Its high accunulative peak was in the blooming period.The co ntents of methyleug enol and safrole in root system show ed two high peaks in one year.One was from April to M ay (from budding to blooming period); Another was in vegetative growth period after bearing fruits.The high content peaks of methyleugenol and saftole in aerial part were all in blooming period.After this period, their contents decreased gradually.

Key words: Asarum heterotropoides var.mandshuricum, Annual development, Dynamic accumulation of active composition