The invention discloses a new method for increasing the proportion of superior commodity crabs. Juvenile river crabs in a large specification cultured in natural water at the high attitude in northern areas of China are bred in southern areas in an intensive cultivation manner to produce commodity crabs. The juvenile river crabs are cultivated for two years, the weight of the juvenile river crabs is 8-10 times that of river crabs cultured with a traditional breeding method, and an existing breeding mode is improved from the breeding source, namely, the variety; as for the breeding procedure, the juvenile river crabs are released in autumn instead of in winter or spring in the traditional breeding method; as for a breeding mode, a temporary cultivation and domestication stage is added, and a one-level breeding mode is changed into a two-level breeding manner; as for breeding management, a constitution strengthening link from release of the juvenile river crabs in autumn to overwintering is added, a traditional feeding mode is changed into an intensive-intensive-intensive-strengthened feeding mode, and demands of the juvenile river crabs during overwintering and growing for nutrients are met effectively. Besides, water plant cultivation in a water pond, promotion of shell removal, conditioning of water quality and other breeding techniques are adopted, and the breeding proportion of the superior commodity crabs is remarkably increased.