In order to improve the shelling effect of cashew husk machine, the factors including speed of shifting fruit, spring’s squeeze removing of the cutter device, the whole kernel rate, the sliding rate and the shedding rate during the shelling process were investigated. The results showed that shifting speed had a significant effect to shelling efficiency (including whole kernel, slide and shedding rates) (P＜0.01）, and the spring’s squeeze removing affected the whole kernel rate significantly (P＜0.01). However, no effect on sliding and shedding rates（P＞0.05）were found. The fruit position while it was feeding has a effect to whole kernel rate and sliding rate（P<0.01）, and it had no effect to shedding rate（P＞0.05）. When the a1 mode was used to feed the cashew, with the blade spacing 9.1 mm and shifting speed 19.8 r/min, the spring’s squeeze removing was 16.7 mm, and the whole kernel rate was improved by 15%, reached to 69.76%.