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500粒/min。A sorting system for maize haploid kernels marked with the Navajo label was designed. It consisted of a seed transmission unit, an image acquisition and processing unit, a sorting-unloading unit and a system control unit. The image acquisition and processing unit identified the haploid kernels according to the color features on maize embryo and the top of maize endosperm. Then it sent the identification information results to the system control unit. The system control unit, which controlled the motion of the seeds transmission unit and the mechanical arm of the sorting-unloading unit, opened the solenoid valves which connected to the mechanical arm. The system separated the heterozygote kernels from the haploid kernels using air-suction and achieved a sorting speed of 500 kernels per minute.