Based on the torsion deformation the gear body and the contact deformation of tooth surface, the fundamental equations of load of the gear was presented, thus established the theoretical basis of the load derivation of the gearing. In this paper, the torsion deformation of the circular arc gears is analyzed first. Then the second order differential equation for the tooth surface load distribution of the involutes gears has been deduced. The equation is applied for the situation where the load is acting on non-continuous engaged point. This forms the theoretical basis for the derivation load calculation of the Novikov gears. Finally, the revision equation to compensate the derivation of the circular arc gears is presented.

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