Abstract: The antimicrobial actions of tea saponin from the Camellia Oleifera were studied in vitro. The results showed that the high concentration of crude saponin has relatively strong inhibition effect to Staphylocooccus aureus, Bacillus subtilis and Saccharomyces cerevisiate respectively, especially to Saccharomyces cerevisiate. Its MIC is 3.2mg/ml. It had no abvious action to Aspergillus fungi. It had selectivity inhibition effect to different plant pathogeny fungus. And its effieacy correlated to teasaponins’c oncentration.

Key words: crude tea saponin, antimicrobial action