Seed-bed cleaning is the precondition for no-tillage planter of conservation tillage.According to the technical requirements placed by the wide-narrow row planting(WNRP for short)in the northeast ridged cultivation region on the stubble-cleaning appliance of no-tillage planter,the paper simulates the motion curve of animal claws; designs a seed-bed cleaning mechanism with the structure of concave-wheel; analyzes the symmetricallydistributed installment method of cleaning mechanism and investigates the influence brought by factors such as the curvature of evenly distributed tooth,the inclination angle of stubble-cleaning wheel and the working speed on the effect of stubble cleaning.