Abstract: A type of seed-metering device with compound filling seeds and gravity cleaning seeds was devised,and the locomotion track of the seeds which was relative to the seed-metering plate was analyzed in the course of filling seeds. According to this, the sucker of the seed-metering device need not be equip with seed-cleaning mechanism which may make seeds fall to pieces and the seed-metering device can solve this problem effectively, especially when the corn seeds were accelerated and cultivated. The results of the field working performance indicated that all performance indexes measured reach the high class product indexes of JB/751017-92, in which the quality of crop precision seed drills is classified.