在平面二包环面蜗杆传动接触分析的基础上得出，影响该传动副使用效果的主要原因是传动副对误差敏感性大，解决办法是对蜗杆修形。提出了修形量的计算公式，指出了在各种误差状态下传动副真实接触位置及其它各对齿啮合线上各点分开的距离，给出了该误差状态下蜗杆的修形值及修形部位、跑合量及跑合时的接触顺序。由修形后传动副的接触状态分析可见，传动副对误差的敏感性已大大降低。最后给出了在某一安装误差状态下的修形方案。 On the basis of the contact analysis of the plane two-package toroidal worm drive, it is concluded that the main reason that affects the use effect of the transmission pair is that the transmission pair is sensitive to errors and the solution is to repair the worm. The calculation formula of the modification amount is put forward and the actual distance between the transmission pair and each other on the meshing line of each pair of gears under various error states is pointed out. Shaped parts, run in the amount of running and running when the contact sequence. The contact state analysis of the transmission pair after the modification shows that the sensitivity of the transmission pair to the error has been greatly reduced. At last, a modification plan of a certain installation error is given.