The effect of the panaquilon (partial component of panax ginseng), on the isolated pregnant and nonpregnant uterus strip was observed. The movement of the strip of the rabbit uterus suspended in Locke s solution was refolded by the Magnus method. 1. The tonus of the pregnant uterus was slightly increased and returned the normal movement after a short period (approximately 60 seconds) in concentration of 10^-6 of panaquilon. 2. The tonus and motility of panaquilon was slightly synergistic when pretreated with syntocinon and barium chloride.