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To study the function and component of greengage(Prunus rnume Sieb.et Zucc)wine.The antioxidant and its function component-lyoniresinol in greengage wine were detected.Method:the capacity of total antioxidant and scavenging to DPPH.of plum wine was measured by the chemical simulation,and a method for the determination of contents of lyoniresinol in plum wine by HPLC was detected.The HPLC separation was preformed on a XDB-CI8(4.6mm ×250mm,5μm),at flow rate 1.0 mL/min,colurun temperature 30℃,with mobile phase of methanol/water (25∶75) and detected at wavelength 202.nm.Resuh:the IC50 value of scavenging to DPPH-of plum wine is 1.388 mg,the value of TAC(capacity of total antioxidant) is 18.785±0.722 (mmol/mL),and the lyoniresinol content is 0.772 mg/L.Plum wine showed stronger anti-oxidative.