Abstract: As a new resource management fishery production mode, marine ranching can not only comprehensively utilize resource advantages, promote integrated development of primary, secondary and tertiary industries, provide a good opportunity for traditional fishermen to change their industries, but also protect ecological resources, which is a new path to explore transformation and development of fisheries． Role of marine ranching development in fishery transformation and role upgrading of traditional fishermen was studied． Under background of developing marine ranching, countermeasures and suggestions were put forward for traditional fishermen to realize role transformation．