Abstract:By analyzing the status bay scallop grading equipment，put forward the necessity of research and development for scallop grading equipment.Through the correlation analysis bay scallops morphological traits characteristic traits of the weight，determined design ofa roller grading classifier based scallop shell length.By comparing test results of two slotted form，identifying the surface of the roll out of the spiral grooves，using changes in ellipticalspiral classifier makes up a major diameter size to achieve scallops classification.And producd a simple test apparatus，carried out verification tests for grading effect.Determined the classification roll structure，itlaid the foundation for the development of scallop grading equipment.