In this article, based on the model of loop geometrical structure of Raschel double needle bar fabrics,the formula of loop length was deduced.

• 本文在建立了拉舍尔双针床针织物线圈几何模型的基础上；推导出线圈长度的计算公式；经实际计算验证简比后可推广应用.；为指导生产实践和新产品的开发提供方便