Myrica rubra was the material,continuous extraction method for both water soluble dietary fiber and water insoluble dietary fiber was established.The extraction technology was optimized by orthogonal test.The optimal conditions for extracting water soluble dietary fiber were:using citric acid as diffusion solvent,Myrica rubra to liquor ratio 1∶10,pH 2.0 under 90℃ for 75 min.The extraction yield reached up to 58.62%.The optimal conditions for extracting water insoluble dietary fiber were: Myrica rubra to liquor ratio 1∶12.5,pH 2.5 under 60℃ for 90min,the extraction yield was up to 61.25%.The water holding capability and hydration capability of water insoluble dietary fiber obtained in the experiment was 570.6% and 6.5 mL/g respectively.The products had better functional properties and excellent physiological activities.