[Objective]The research aimed to provide experimental references for antimicrobial activity study of plant secondary metabolites.[Method] It was studied on the antimicrobial activity to bacteria and fungi of flavonoids extracted from Camellia japonica and Loropetalum chinese flower with 70% ethanol.[Result] The results showed that flavonoids from Camellia japonica petal was lack of the antimicrobial activity to Escherichia coli,Staphylococcus aureus,Bacillus subtilis,an unknown bacterium(G+ bacterium).The a...