In order to solve the issue of idealized test results caused by not considering seed-to-soil contact displacement during the testing of seed meters, a material-laying seed meter test bench was designed. The differences between the detection mechanism of testing bench and working mechanism of ground wheel-driven planter and formation mechanism of residual speed of seeds discharged by seed meters were demonstrated. The formula for the calculation of residual speed of seed spreader was derived, and the residual speed of peanut stratified fertilizer rotary tilling and ridging seed spreader with operating speed of 2.12km/h was calculated to be about 0.25~0.42m/s. The simulation was carried out by using the EDEM software and the offset distance and falling depth of spherical and non-spherical seeds (taking peanut as example) at 10~20cm casting height, 0~0.42m/s residual speed, and 30 ways of touching the soil showed that the larger the falling depth of the seeds was, the smaller the offset distance was; the lower the casting height was, the smaller the falling depth of seeds would be, but the offset distance would be larger; the larger the casting height was, the smaller the residual speed, the greater the falling depth and the smaller the offset distance would be; the specific combination of angular velocity and residual speed can reduce the offset distance of the seed. Using this testing bench to carry out the central combination test on the seed meter, it was got that this seed meter had the best operation effect when the working speed was 2km/h, the seed casting height was 15cm, and the residual speed was 0.21m/s, and it reached 87% of the operation qualification rate. The results of field test showed that the best operation effect was achieved when the working speed was 2.12km/h and the seeding height was 15cm, and the qualified rate of seed spacing reached 84%, which proved that this testing bench can accurately detect the qualified rate of the seed meters and explore its optimal working parameters.