Abstract: In order to adjust seeding rate via the rotate speed and provide with the theories for designing high-speed and high performance seeder, the limit turning speed test was done. The test aimed at the eccentric round hole-wheel seedmeter seeding three rows each time on the performance test bed. The test studied the limit rotate speed in working order and the relation between the rotate speed and seeding amount, seeding uniformity and the consistency of total seeding amount in each row, respectively, and set up the mathematical model about the relationship between unit seeding amount and speed. The results showed that the limit turning speed did not exceed 70 r/min and the lowest turning speed was not less than 30 r/min. Its seeding uniformity was 13.09%-30.09% and the consistency of total seeding amount in each row was 3.28%-4.70%. There was a linear relation between unit seeding amount and speed. The results provide data and theory for designing a rape high-speed seeder and further study on the rotate speed and seeding quantity.