Abstract:Principle of double helix mechanism was analyzed. Through orthogonal tests, the prominent elements were defined. Though regression tests, the optimization parameters of prominent elements were calculated as below: helix-dragon rotating speed of 319r/min, distance between up and down helix dragons of 575mm,distance between helix top and cutting knife of 10mm, lift angle of helix dragon of 30°. And the transporting index reached to 89.8, which could meet the demand of transporting long-straws.