Abstract:The heat pump-microwave combined drying process of zanthoxylum schinifolium was optimized by multi-index comprehensive scoring method.Taking the chromatism as the index，the single factor tests of heat pump drying temperature，converted moisture content and microwave power were carried out.On the basis of single factor test，the three indexes of unit energy consumption，the chromatism and volatile oil content of dried zanthoxylum schinifolium were weighted according to certain weights.The calculated comprehensive score was the response value，and the Box-Behnken center combined test design was carried out，and the response surface optimization analysis was performed.The results showed that the optimum technological parameters of heat pump - microwave combined drying process were：heat pump drying temperature 59 ℃ ，converted moisture content 40%，microwave power 340 W.Under this condition，the comprehensive score was 0.285 47，and the relative error from the predicted value of the response surface model was 0.29 %，so the optimization result was reliable.