Abstract: Available stone cleaner was only suitable for rice and wheat. A stone cleaner for red bean was developed and the effects of rotation speed of crank, air flow speed and link length on working performance were studied experimentally. The results show that in normal working condition the parameters almost do not affect the product purity and only affect the stone content in discharged material. The rotation speed of crank and air flow speed are the main factors. If selecting the suitable parameters and increasing air flow speed in opposite direction, the stone cleaner can get rid of stones from the redbean. Under the same working condition the performances of removing stones on frogmouth table and woven screen table were studied． An idea for improving design by combined tables was proposed.