Abstract: In view of the cusp-type opener of no-till wheat seeders was easy to be wrapped by grass, and be jammed when opening and its working life was short in conservation tillage system in the hilly area of southwest, the arc blade type opener was designed. The geometry model of arc blade type opener was established, and the discrete element method was adopted for analyzing the working resistance. The results indicated that the average opening width was 40mm, deviation of opening depth was 5 mm, cut rate of corn stubble was over 86%, soil disturbance rate was 18%-22%. The arc blade type opener can improve the traffic ability of seeder, and the performances of opening and cutting stubbles are excellent, so it can satisfy the opening requirement of wheat no-till sowing in the hilly area of southwest.