0.46～0.55 m.3/h。Applying quadrate regression experiment with general rotary design method, mathematical models that described relation of seed dispensing criteria and influence factors of the metering device were established, and the impacting tendency and regularity of influence factor on seed dispensing criteria were analyzed. Experimental results showed that higher single seed index with lower multi-seed and missing seed index could be achieved for Jingfeng cabbage seed when cell diameter and sell depth of metering disc were 2～3.5 mm and 2.2～3.6 mm respectively, and air current amount was 0.4～0.55 m3/h. With the maximum single seed index as goal and the minimum multi-seed and missing seed index as constrains optimal parameters of the disc cell was determined as diameter is 2.4～3.5 mm, depth 2.8～3.4 mm, and air current amount 0.46～0.55 m3/h. 