Abstract:To deal with the problem during the process of making Wuyi rock tea，a lot of leftover such as crude old leaves and tea stems would be produced，the crude old leaves were used as raw materials in this study，and the papain and cellulase were added to assist the extraction，so as to improve the nutrition and the flavor of the aqueous extract and provide the materials and basis for the next step of preparing tea beverages and instant tea powder.Taking the total amount of free amino acids as the index，the single factor experiment was carried out by combining the two enzymes，the total enzyme amount，the extraction temperature，the extraction time and the ratio of material to liquid，and then the orthogonal experiment was used to optimize the process.The results showed that the optimal extraction process was the combination of cellulase and papain with enzyme activity ratio（U/U）5∶5，total enzyme amount 1 000 U，enzymatic hydrolysis temperature 50℃，enzymatic hydrolysis time 25 min，the liquid ratio was 1 ∶22（g/mL）.The total amount of free amino acids in the aqueous extract obtained under this process condition is the highest，being up to 26.97%.