In order to reduce the entrainment loss of rape seeds，a straw walke of 5TY–100 rape thresher r was designed to carry out the bench test to explore the dependence of the separation performance of the material on the various parameters of the straw walker. The result showed that the influences of the parameters of this straw walker on the separation performance of rape vibrating thrashingin sequence is vibrating direction angle, crank speed, swing angle and amplitude. The optimal performance of thrashing separation is achieved under the vibrating direction angle in 30 degrees, the crank speed in 250 r/min, the swing angle in 28 degrees, and the amplitude in 28 mm.