Abstract: In order to make inside-filling metering device widely be employed in peanut planting machine, The experiment and research on inside-filling metering device were had based on the operation platform of JPS-12. The effect of metering axle rotating speed, metering height and seed size on performance of metering device was analyzed with research method that combined single and multi-elements experiments. Qualified rate of seed hole distance, double seed rate, single seed rate, repeat rate, omitting rate and damage rate were selected as the performance indexes. Through variance analysis on results of above mentioned experiment, when discharge rotating speed was 30 r/min, discharge height was 25 cm, peanut breed was Fenghua 5, the discharge performance was the best, The discharge performance is that the qualified rate of seed hole distance was 96.12%, double seed rate was 96.36%, single seed rate was 0.91%, repeat rate was 1.82%, omitting rate was 0.91% and damage rate was 0.35%. The experimental research provides a foundation for design and improvement of high efficient peanut planting devices.