Abstract Field breeding mechanization could advance breeding efficiency hundredfold, save invest, cut down breeding periods, reduce labor intensity. The breeding cover region of different crop and every breeding process. Breeding aim is cultivating better breed, improving cultivation techniques, ensuring the higher yield. Mechanical reap of wheat breeding is still underdeveloped in our country,the common reaper is not able to breeding require.On the base of existing reaper, some structures have been optimized,some parameter has been perfected. At the same time,some empirical data and advanced machine has been used for reference in this paper. Keywords: Subzone breeding,reaper,research design