An approach application of gear meshing theory for calculating tooth working-surface contact , tooth edge contact and normal vector of helical gear real tooth surface is proposed to improve the transmission properties of drive gear .We represented the real tooth surface with a sum of two vector functions that determine the theoretical tooth surface and the deviation surface fitted by 3 B splines based on tooth surface mesh data from 3-dimentional co-ordinate measuring machine , and the normal vector of the deviation surface was deduced , having drawn up a set of calculation procedures , which simulate TCA of the helical gear tooth with various deviation surfaces .The model is proved to be correct when applied to gear drive of pinion with longitudinal and three-dimensional adding deviation surfaces , and provides a new method for TCA of real helical gear tooth surface .%基于三坐标测量的齿面网格节点偏差，经过三次B样条拟合得到法向偏差曲面，通过理论齿面与偏差曲面叠加构造斜齿实际齿面，推导了齿面法矢、齿面接触与边缘接触；编制了1套斜齿轮TCA程序，能够对各种实际齿面进行TCA仿真；通过齿向和三维修形算例验证了方法的正确性，为斜齿轮实际齿面接触分析提供了新方法。
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