Abstract : this paper has deduced a new method for risering ， ? parametric method . it has proved with the test curve of the british castin g p ractice commission . practical results have well perfected furt her the perimetrischen quotlent method for risering . a conclusion is drawn that rise r supplement shrink efficiency is directly proportion to the ratio of casting to riser perimetrischen quotient 文摘:提出的冒口设计新方法?参数法，与英国铸造实践委员会给出的实验曲线相互印证其实用性，进一步完善了冒口设计的周界商法；得出了冒口补缩效率与铸件和冒口的周界商比值成正比的结论。
