Objective: To optimize flocculation clarification technology conditions of Yilingjing oral liquid by chitosan. Method: Taking absorbance and retention rate of stilbene glucoside as evaluation indicators, influence of the mass concentration of extraction liquid, chitosan dosage, pH, temperature, stirring speed, stirring time and other factors on flocculation effect were investigated. Based on single factor test, orthogonal design was selected to optimize flocculation technology with the mass concentration of extraction liquid, chitosan dosage,...