Objective:To optimize the co-production extraction process for oleanolic acid(OA),ursolic acid(UA)and total flavonoids from the peel pomace of Chaenomeles speciosa(Sweet)Nakai.Methods:A single factor test was conducted to determine the sensitive regions for the extraction of the above three substances,and then an orthogonal test was used to optimize the factors of co-production extraction process:extracting time,temperature,the ratio of solid to liquid and solvent concentration.The contents of oleanolic aci...