In this paper the author using tensor calculus shows that the equation for induced normal curvature of Nankai University and that of Sakai (Japanese) are of unity.

本文作者利用张量计算，证明了南开大学的诱导法曲率公式与日本酒井公式是统一的，一致的。

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The induced normal curvature of two conjugate tooth surfaces along normal direction of contact line is one of the important indexes evaluating mechanical transmission performances.

两共轭齿面沿接触线法向的诱导法曲率是衡量机械传动性能的重要指标之一。

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