Abstract: Corn growing is large scale in China and its regional distribution is wide.Nowadays，harvest rate of maize machinery has been increased.Corn snapping bars harvesting has become a transitional harvesting method.Seed harvesting will be the growing trend for maize harvesting.Maize seed harvesting are divided into two methods.One is corn snapping bars and threshing harvesting.It has become a mature maize harvesting technology in European and American countries.The other is whole-feed threshing harvesting.It is same to other grain harvesting machinery.Stems will be crushed in threshing chamber and removed out of harvester.Ears will be threshed and the seeds resulted will be fed into grain tank.A key description was given that research and design results of some key components in process of whole-feed corn seed harvesting based on modifying and replacing of partial working elements of wheat harvesters.