Abstract: In order to improve the mechanization level of breeding experiment, reduce labor intensity, according to the demand of the subdistrict breeding seeder, a metering device named insert-metering device for subdistrict breeding seeder was designed. The performance of the metering device was tested by the different working speeds and inter-plant spacing. Results showed that while the working speed was from 0.4 m/s to 0.6 m/s, inter-plant spacing was 8.5cm, the acceptability rate was equal to or greater than 82.45%, the multiples rate was equal to or less than13.38%, the miss rate was equal to or less than 4.16%, which all met the requirement on the highest class product; while inter-plant spacing was 4.0cm, the acceptability rate was equal to or greater than 65.25%, met the requirement on the first class product, the multiples rate was equal to or less than 13.87%, met the requirement on the highest class product, the miss rate was equal to or less than 19.50%, met the requirement on the first class product. The experiment results indicated that the structure and breeding performance of metering device satisfied the agriculture requirement.