Abstract: In order to design pneumatic classifier and pneumatic conveying equipment of peanut sheller, based on main peanut varieties which were planted in Liaoning province as the research object, aerodynamic characteristics of shelled peanut mixtures were tested and floating coefficients of broken peanut pod, no-shelled and smaller peanut pod, peanut kernel, peanut shells and small stone were separately gotten for 0.168-0.246、0.102-0.146、0.080-0.186、3.287-6.037、0.031-0.045 m-1. The results showed that: the floating speeds of broken peanut pod, no-shelled and smaller peanut pod, peanut kernel, peanut shells and small stone were obviously different and more suitable for air separation. The test conclusion has important significant for improvement of pneumatic classifier and pneumatic conveying equipment of peanut sheller.