In order to find out the main influencing parameters of buckwheat huller on the hulling effect in the working process,rotational speed of sand disc,hulling gap,width of working face and size of sand disc were selected as the influence factors,and effects of the above 4 factors on the limited flow and the effects of rotational speed of sand disc on the hulling effect were analyzed.The results showed that,the rotation speed of sand disc had a significant effect on the rice yield rate and relative rice breaking rate.When the rotating speed of sand disc was higher than 950 r/min, the relative broken rice rate rose sharply,but the effect on the limited flow was slow.In the range of 5 to 7 mm of hulling gap,the limited flow increased linearly with the hulling gap.The width of working face would lead to decline of the limited flow linearly.The size of sand disc had little impact on the limited flow.So for ensuring the hulling effect,it has potential value to optimize the influence of hulling gap and working face width on the limited flow.