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A prototype of inside-filling air-blow seed-metering device was developed to overcome the deficiency of mechanical precision metering device with high rate of cell blocked and seeds absent. Simulation analysis of flow in the prototype was carried out with software ANSYS/CFX. The simulation results showed that the pressure fluctuation in the prototype with stomata was fewer 93Pa than it without stomata. The laboratory test results indicated that seeding performances of the seed-metering devices with stomata was much better than it without stomata: quality of feed index and miss index of the devices without airblowing drop, with no-stomata air-blowing drop and with stomata air-blowing drop was 66.8%, 78.4 %, 82.0% and 14.4%, 4.4%, 2.4%, respectively.