Objective:To optimize ethanol extraction technology of zhcnweiyanggan tabletMethods:Ethanol extraction technology were optimized by orthogonal tests with yield of extract and the amount of the extracted OIeanolic acid as indexes,and with soaking time, water volume and extracting time as factors. Results:Optimum ethanol extraction process was as follows: soaked in 85 % etha- nol for 2. Oh, reflux extracted 2 times with 8,6 times the amount of 85 % ethanol by 1.0,0.5h, respectively. Conclusion: The opti- mum extraction process was ...