Abstract: In order to solve problems of plant winding threshing roller and capsule collection during flax mechanized harvest process，comb-brushing and air-absorbing flax capsule harvest testbed was designed.Taking shape of comb tooth section，rotary speed of comb roller，relative travelling speed of machine and air volume of centrifugal fan as test factors，capsule collection rate and plant winding rate as test indexes，orthogonal test with four factors and three levels was carried out.Results showed that optimal combination of test factors as follows，comb tooth section was round，rotary speed of the brush roller was 44 r/min，relative speed of the machine was 80 mm/s，centrifugal fan air volume was 6 000 m3/h.Under conditions of better combination of experimental factors，capsule collection rate was 96.67% and plants winding rate was 0.32%，the effect of carding，collecting and anti-winding of testbed were better.Comb-brushing and air-absorbing flax capsule harvest testbed could provide a feasibility scheme for problems of plant winding threshing roller and capsule collection.