In order to explore the response and the heating mechanism of pulse eddy current thermography when eddy current parallels to the crack,the heat distribution of ferromagnetic and non-ferromagnetic materials across crack defect was analyzed by the finite element under parallel excitation;the difference of temperature distribution between non-ferromagnetic and ferromagnetic materials was explored by analyzing the parameters of magnetic flux density,current density,temperature,etc. The result shows that the crack edge temperature increases besides the tip effect,which is caused by surface skin effect on the ferromagnetic materials. A high frequency induction heater is used to verify the conclusion. The experiment results are consistent with the simulation data and mechanism analysis. Research results reveal the temperature response of non-ferromagnetic materials under parallel excitation,and lay the foundation for the possibility of engineering application in the crack of the qualitative analysis and the quantitative characterization.