根据地膜覆盖精量播种玉米的要求，研制了棱锥型孔排种部件，介绍了它的工作原理及基本参数，经台架试验得出了该排种器结构参数的较优设计方案。在较优设计参数下，棱锥型孔排种圆盘的线速度ｖ＝０．８０７ｍ／ｓ时，单粒率为９３．６７％，空穴率为１．６７％，其指标达到了机械式膜上玉米精量播种的先进水平，为地膜覆盖播种玉米提供了一种机械式精量排种器。 According to the requirements of mulching with precision mulching corn, a pyramidal hole seeding part was developed, its working principle and basic parameters were introduced, and the optimal design scheme of the moulder’s structural parameters was obtained through bench test. Under the optimal design parameters, when the linear velocity v = 0.807m / s of pyramidal perforated disk, the single particle rate is 93.67% and the cavity ratio is 1.67% The advanced level of corn precision sowing on the film provides a mechanical precision seed metering device for mulching of seeding corn.