Abstract: With the aim at demand of precision seeding for coix on small hilly land in Guizhou province，scoop wheel precision seeding machine was applied for coix seeds hole sowing.According to requirements of coix seeding，the best parameters matching of seeding machine was discussed and analyzed.Under premise of fixed hill spacing and demanded seed filling performance，the function relation of conveyor velocity and rotate speed of discharging seeds was established.The ratio between holes of scoop wheel and grooves of discharging wheel was optimized.Experiments were carried out on seeding platform.Results of experiments showed that the speed of conveyor belt had no significant effect on number of discharged seeds.The requirement number of discharged seeds could not be satisfied when ratio of holes-grooves was 18∶18.The optimum parameter matching for seeding machine was that ratio was 18∶9，hill spacing was 140 mm，driving speed was about 5 kmh，and corresponding rotated speed of discharging shaft was 33.18 r/min.