Orthogonal experiments were designed for optimization of the extraction and purification technologic conditions of procyanidins from Parthenocissus thomsonili planch.Results showed that extraction for 80min,ethanol volume fraction of 75%,the optimum combined conditions were extraction temperature at 65℃,solution ratio of 1:10.After preliminary purification of extract solution,color reactions produced by vanillin hydrochloric acid method,the average procyanidins contents of stem,fruit peel and seed determine...