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For the design of the pneumatic conveyor type metering system, wheat seeds were taken as test object to provide a reference basis, and through the calculation on the fluid dynamics and the coupling of the discrete element method to make numerical simulation. The standard k-εmodel of unsteady coupling Lagrangian algorithm coupling simulation was used to simulate the gas-solid two-phase flow. The high-speed camera technology was used to capture images of the seed movement process in the seed tube for the experiment. The collected image was processed by binaryzation, color inversion, differential and corrosion and processing. The seed movement distance was extracted according to the characteristics of the seed area and the position of the center of mass, and the actual movement speed of the seed was calculated. The simulation and test results showed that the seed velocity in the seed tube was mainly affected by the wind speed, but the seed application rate had little influence. The relative error range between the simulated and experimental values of seed velocity at different wind speeds was 4.28%~6.06%, and the ratio of simulation test results to real test results was approximately constant, which was supposed to be due to the influence of seed sphericity on movement speed. The results showed that the correction coefficient of the seed velocity in the seed tube was 0.95. Therefore, the simulation test of seed velocity through fluid solid coupling simulation had a high accuracy，which verified the feasibility of the method of measuring the seed velocity of the seed tube based on EDEM-Fluent gas-solid two-phase flow coupling simulation. The research can provide a new method for measuring the seed velocity in the seed tube.