Abstract: In order to obtain design parameters of air-suction metering device for Panax quinquefolium，seeds of Panax quinquefolium commonly planted in Wendeng area of Weihai were studied.Triaxial geometry size，1000-grain weight，resting angle and sliding friction angle of panax quinquefolium seeds with and without accelerating germination were tested，and variation law of physical parameters of Panax quinquefolium seeds under different moisture content was analyzed.Results showed that average triaxial size of unbudded Panax quinquefolium seeds with moisture content of 7.46% was 5.84 mm×4.97 mm×2.77 mm，average 1000-grain weight was 32.79g，and resting angle was 36.44°，sliding friction angles（plastics，aluminum and stainless steel）were 21.2°，25.8° and 19.2°.Average triaxial size of accelerated Panax quinquefolium seeds with moisture content of 46.67% was 6.31 mm×6.12 mm×3.95 mm，average 1000-grain weight was 60.21 g，and resting angle was 45.42°，sliding friction angles（plastics，aluminum and stainless steel） were 26.7°，27.5°and 25.1°