By the solution of the model,a calculating formula of the local dihedral angel of intersecting line and a parametric equation of contacting li.

• 通过对此数学模型的求解,导出了相交双管相贯线上各点局部二面角的计算公式,给出了相交双管装配接触线的参数方程,并解释了其数学本质。