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According to the material properties of hulling rapeseed, a kind of hulling rapeseed separator was designed by combination air suction above the sieve with shaker. The separation principle and the main structural parameters were analyzed. It was studied that the separation result was affected by feeding volume, wind speed of front wind tunnel as well as wind speed of behind wind tunnel. The results showed that there was an optimal value for the effect of feed volume on rate of the hull containing kernel. Comparing with wind speed of behind wind tunnel, wind speed of front wind tunnel had more effect on the rate of hull including kernel and the rate of kernel including hull. The loss rate of separator was lower when feeding volume, 〖JP2〗wind speed of front wind tunnel, wind speed of behind wind tunnel were 750kg/h,1.5m/s, 5.3m/s.