The method of precise modeling of spur gear is illustrated by an example.The concrete design principles are introduced as well.A constructed pair of gears is fixed normatively to give birth to gear model.By way of ANSYS
the gear model is transformed to the finite element model consisting of nodes and elements.Then NR method is used to get the statics solution by contact stress
and the arithmetic principle is introduced.The new contact element method proposed in the thesis is proved to be precise