Abstract: To study continuous scaling method for freshwater fish, sliver carp, bream and carp were taken as test objects, and a scaling brush was proposed which used springs as the main scaling structure. Then the influence of three factors on scaling ratio and body injury of freshwater fish was studied by using a scaling test equipment made by authors, including spring external diameter, brush rotating speed, brush diameter. It showed that spring external diameter and brush diameter had a significant influence on scaling ratio and had no significant influence on fish body injury. However, the brush rotating speed had significant influence both on scaling ratio and fish body injury of freshwater fish. Different fishes needed different spring external diameter, brush diameter and brush rotating speed while be scaled. Then the optimal combination of the key factors were determined by the test, which were spring external diameter 21 mm, brush rotating speed 1120r/min and brush diameter 90 mm. This study can provide reference for the design of continuous scaling equipment for freshwater fish.