Abstract: The antimicrobial action of EGb (Extract of Ginkgobiloba L) against against a series of bacterium is studied.The results showed that the EGb caneffectively inhibit the growth of bacterium.The antimicrobial minimum dosage of EGb are as follows Staphylococcus aureus:8% Proteus vulgaris 6%;Escherichia coli 6%;Bacillus subtilis 6%: Salmonella Sp 6%.Amerebacter aerogenes 5%.When the period of reaction time is the same the higher the concentration of the extract the higher the antimicrobial effect.When the concentration is the same the longer the reaction period. the higher the antimicrobial effect of the extract .And this extract is characterised by its heat stable ability.

Key words: FGb antimicrobial, Saction, Pathogenetic microbes