OBJECTIVE： To optimize the clarification and purification technology of Perillae folium extract. METHODS： The effects of 3 clarification and purification methods as chitosan flocculation clarification， ZTC 1+1-Ⅱflocculation clarification， water precipitation on retention rate of total flavonoids and removal rate of solid of Perillae folium extract were compared to screen suitable clarification and purification technology. With the retention rate of total flavonoids and removal rate of solid as comprehensive evaluation index， single factor and orthogonal test were designed to investigate the optimal value of concentration proportion， the amount of the flocculant， flocculation temperature and whisking speed in optimal clarification and purification method. RESULTS： Among 3 methods， the chitosan flocculation clarification was the best with concentration proportion of 1 ∶ 4， chitosan of 1.0 g/L， flocculation temperature at 60 ℃， whisking speed of 100 r/min， whisking time of 4 min， standing time of 12 h. Under the condition of optimal processing， the retention rate of total flavonoids was （85.1±0.75）％， and the removal rate of solid was （24.6±1.33）％ （n＝5）. CONCLUSIONS： Chitosan flocculation can be used to effectively remove the impurity of Perillae folium extract， and optimized clarification and purification technology is stable and feasible.