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The research on material air separation mechanism and the obtained relevant parameters is important basis for the design of air separation machine. The “dry shell and wet kernel” material of hickory after breaking was taken as the research object. Through mechanical analysis and coupling simulation of material, the parameters of material recovery coefficient, static friction coefficient, rolling friction system, particle free suspension velocity and instantaneous acceleration during collision were clarified. On this basis, an air separation test platform was designed for the aerodynamic characteristics of hickory for experimental research. According to EDEM and FLUENT coupling simulation, high-speed camera and professional measuring instruments, the required wind speed range, design parameters, motion trajectory and mechanical parameters were determined. The simulation model was verified to be applicable to the design and simulation test of virtual prototype by comparing simulation and test-bed test results. The suspension velocity range of each material of Carya cathayensis obtained by the experimental typhoon selection test was as follows: one dew kernel was 6.8~10.3m/s, two dew kernels was 7.5~10.1m/s, broken kernels was 6.9~9.8m/s, two dew shells was 5.3~7.9m/s, broken shells was 4.8~7.6m/s, and shell-kernel chimes was 5.9~9.4m/s, respectively. The mixed material test confirmed that the overall cleaning rate was 99.2% and the false selection rate was 0.8% when the wind speed was 8.2m/s, the water content of kernel was 23.6%, the water content of shell was 5% and the windward face ratio was about 50%. The maximum impact force of the remaining materials was 0.0031N when the water content was 23.6%, the wind speed was 11.7m/s, and the cleaning rate was 100%, the false selection rate was 2.3%, and the water content was 23.6%. The research provided reference for the research and development of pecan air separation technology and equipment.