Anhua county of Hunan Province is rich in pueraria resources, superior quality, but the use ratio is low, the phenomenon of waste is serious. With single fator and orthogonal experiment, ascentain best color protecting agent, best protecting time/temperature and cooking time. The best technology of making slice-hot air drying will be identified as: 0.35 % ascorbic acid, 0.35 % citric acid and 0.2 % sodium metabisulphite;protecting color time 45 min, cooking time 24 min, drying temperature 55 ℃.The content of kudzu root flavanone in Anhua Puer...