Abstract: The pigment in the browse leaves was extracted from L. Chinese Var. Rubrum leaf with Microwave treatment and distilled water or 20% EtOH.The antibacterial activities of the extracts on the three kinds  bacteria were determined by Oxford Cup method.If the extracts can abstrain the bacteria obviously,the MIC of crude drug were determined by microdilution technique.The results show that the  extracts from browse leaves by distilled water under microwave treatment have obviously antimicrobial activity on three kinds bacteria,the MIC of crude drug of the extracts from browse leaves on E. coli,shigella dysenteroae,staphylococlus aureus are 0.014 g/mL,0.010 g/mL,and 0.010 g/mL.The extracts from  browse leaves by 20% EtOH were obviously active against staphylococlus aureus and shigella dysenteroae but can not abstrain the E.coli.

Key words: L. chinense Var.rubrum, antibaterial action, minimal inhibition concentration of crude drug (MIC)