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Using the computer fluid dynamics software Fluent, the seed particle force in the airflow field of precision seeder device was analyzed. Selecting four factors（relative pressure, aperture of suction hole, distance of seed and suction hole, seed attitude）, the seed particle force was studied through orthogonal simulation test, and the impact of precision seeder device working parameters on the particle force was analyzed. The mathematical model of seed particle force in airflow field was established, and the order of the effect factors was as following: distance of seed and suction hole, seed attitude, relative pressure, aperture of suction hole. The range of suction hole adsorption was 0.34～1.90 mm. Conducting experiment on the vacuum-vibration tray precision seeder device, the results of experiment were consistent with the theoretic analysis and show the correctness of the established model.