In order to reuse the processing waste of forest resources,this experiment used Hippophae rhamnoides pomace as raw material,using ultrasonic-assisted enzyme method,and analyzed the effects of four factors,namely cellulase addition,ultrasonic temperature,ultrasonic time and material liquid ratio,on the extraction effect of dietary fiber.With the yield ratio of soluble dietary fiber (SDF) and insoluble dietary fiber (IDF) as the index,response surface methodology was used to analyze the extraction effect of dietary fiber.The results showed that the SDF/IDF was 0.21±0.01,and the swelling capacity and oil holding capacity of total dietary fiber (TDF) were 3.12±0.13 mL/g,（4.47±0.41）% respectively under the optimum conditions of 5% cellulase and ultrasonic treatment at 60℃ for 50 min.Therefore,ultrasonic-assisted enzyme method can effectively improve the extraction efficiency of products,and has certain significance for promoting the development and utilization of Hippophae rhamnoide by-product resources.