本文针对双自由度锥面包络圆柱蜗杆传动这种新型传动形式，从设计角度出发，首次提出了以最佳接触区为目标函数，对该蜗杆副齿形参数进行优化设计的方法。优化结果不仅使得接触线的形状、分布等有利于动压油膜的形成，而且使其承载能力也有较大的提高。同时，通过该优化方法可使这种蜗杆副齿形参数的选择不再变得自由。 Aiming at the new transmission form of double degrees of freedom conical enveloping cylindrical worm drive, from the viewpoint of design, the method of optimal design of the worm gear pair profile with the best contact area as the objective function is proposed for the first time. The optimization results not only make the shape and distribution of the contact lines conducive to the formation of dynamic pressure oil film, but also greatly improve the carrying capacity. At the same time, the selection of such worm gear profile parameters can no longer be made free by this optimization method.