The physical characteristics (geometrical size, 1 000-grain weight, porosity rate, rest angle, internal friction angle and sliding friction angle) and aerodynamic characteristics (floating speed, floating coefficient) of coated K326 tobacco seed were measured. The results showed that average geometrical size was 1.691 mm in length,1.687 mm in width and 1.687 mm in the height; 1 000-grain weight was 5.12 g, porosity rate was 42%, rest angle was 23.49°26.95°, internal friction angle was 4.5°, sliding friction angle was 7.85°11.35°(stainless steel plate), the floating speed was 6.35 m/s and the floating coefficient was 0.24; At the same time the friction angle of naked tobacco seed (rest angle, internal friction angle, sliding friction angle) were measured, The results showed the rest angle was 32.58°35.72°, internal friction angle 5.15° and sliding friction angle 5.15°9.34°12.7° (stainless steel plate). The volume of the naked seed increased and the shape of the seed become sphere after coated. Compared to the naked tobacco seed, rest angle, internal friction angle and sliding friction angle of coated tobacco seed were smaller which is beneficial to the seed flowing.