Abstract: Microwave assisted enzymaticd was used to extract soluble dietary fiber(SDF) from oil-tea camellia cakes to improve the utilization rate of camellia cakes,based on the single factor experiments. Box-Behnken central composite design principles were used to select the power of microwave,p H,enzyme dosage and time as four parameters of response surface design to optimize extraction process. The results showed that the amount of an enzyme 0.7%,extraction time 2 h,p H 5.0 and microwave power 450 W. The rate of SDF was15.63%,comparison of theor-etical values with SDF,the relative error of SDF was 0.45%,and repeatability was very good. Therefore the optimization of processin parameters for extraction was accurate and reliable.