Abstract: In order to obtain design basis of precision seeder metering device and automatic seed supply device in wheat plot，Ji-mai 22 seeds were selected as measurement object at early stage of research.Physical parameters such as 1000-grain weight，volume weight，triaxial size，angle of repose and static friction coefficient of seeds were measured.Average 1000-grain weight of Ji-mai 22 seeds was 46.02 g.Average volume weight was 831.30 g/L.Mean values of long，medium and short axes of triaxial size were 6.47，3.42 and 3.08 mm，respectively.Mean angle of repose was 28.9°.Static friction coefficient between wheat and stainless steel plate was the smallest，which was 0.427.Determination of above parameters provided a strong data support for determination of relevant parameters of seed metering device and automatic seed supply device of precision seeder in wheat plot，and improved working performance of whole machine to a certain extent.