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Nowadays the electromagnetic induction quenching approach has been widely applied in the surface treatment process, especially for the parts made by metal materials such as the crankshafts. In this paper, quantitative study was adopted in researching the strengthening effect of this technique. First the multiphysics simulation was achieved to carry out the key information caused by this approach such as the temperature and residual stress distribution property. Then the directly defined critical distance model introduced by Taylor D was combined with the simulation results for the fatigue load prediction. Finally the prediction results were verified according by the standard bending fatigue experiments. The main conclusion of this paper is that the combined critical point method and the Goodmen mean stress model shows the best performance in the prediction. Moreover, the Gerbera mean stress model is the most suitable choice for the critical line method.