Abstract: According to the requirements for seeding accuracy of pneumatic roller-type vegetable seeder and feed-rate of seedling tray matching up to rev of seeding device, a controlling system based on C language for the seeder developed by using ATmega16 MCU as core hardware, every cell pan position detection control strategy and modular design of the program approach. The system could solve the impact of the cumulative error on seeding caused by seeding roller line speed and cell pan convey speed difference in continuous work, and it could make the seeder operate in working conditions rapidly and prevent overshooting phenomenon when hard braking was used in high speed working conditions, which insured that seeding device could operate stably in high-speed under the same seeding accuracy conditions. The result indicated that the error between measurement value and theoretical value was up to 2.01% in the operation speed of seeding roller and cell pan convey device under different productivities. The difference between seeding roller line speed and cell pan convey speed was up to 0.1 m/min; it was far less than the theory of permit value 14.4 m/min, which could meet the work requirements of the seeder.