Abstract: This paper is a preliminary report on the molluscicidal activity of seed of Camellia sinensis (L) O. Kuntze (SCS).Its LD 50 and LD 90 were 10 and 16 μg/ml,respectively.We found also SCS inhibited oxygen consumption 65% and glycogen content of Oncomelania snail by 80%.The activity of hatching eggs to juvenile snails was inhibited by this seed at 8-16 μg/ml.Juvenile snails may also be killed by this molluscicide.