[ Objective] The optimum extraction technology of antifungal ingredients from eight medicinal plants such as coptis root and clove, etc. and their antifungal effects on two species of plant pathogens were studied. [ Method] The effective ingredients of medicinal plants were extracted by water, ethanol and acetone. The minimum inhibitory concentration （MIC） and antifungal rate of extracts from medicinal plants were determined using plate diluting method. [Resets] The optimum medicinal plants and the extraction methods inhibited two plant pathogens were as follows： clove extracted by ethanol and acetone, and cinnamon extracted by ethanol could be adopted to inhibit Fusarium oxysporum Schl., MIC at that mo- ment reached 4 mg/ml. Clove extracted by ethanol and acetone, and cinnamon extracted by ethanol could be adopted to inhibit the pathogen of Cistanche deserticola, MIC at that moment reached 4 mg/ml. [ Conclusion] The antifungal effects of ethanol and acetone extracts on tested patho- gens were obviously superior than that of aqueous extracts.
