The antibacterial activity of the water extract form leaf of Citrus unshiu Marc was strdied. The resulte indicated that 0.17-0.50g·mL-1 leaf extract form C. unshiu had different antibacterial activities to Escherichia coli (Migula)Castellani et Chalmers,Staphylococcus aureus Rosenbach,Candida albicans (Robin)Berkhout and Bacillus subtilis (Ehrenberg) Cohn,diameters of antibacterial zone weere 0.14-0.39cm. The antibacterial activity to E.coli was the best with the water estract,the diameters of antibacterial zone were 0.22-0.38cm. With the concentration of the leaf extract increased,the antibacterial activity to the tested bacteria and yeast gradually increased.
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