From the seeds of the Yunnan bean, we purified an antifungal peptide using affinity chromatography on Affi-gel blue gel, FPLC-ion exchange chromatography on Mono S, and FPLC-gel filtration on Superdex 75. The antifungal peptide was adsorbed on Affi-gel blue gel at pH 7.8 and Mono S at pH 4.5. It