In the thermal fatigue test of cylinder head, the shaped laser beam is chosen as the heating source to simulate the real fatigue. In order to make the experimental and simulated results agree with each other, the model parameters need to be verified. According to the surface structure, different laser loading experiments are proposed to measure the temperature on the cylinder head. The finite element model is set up and the parameters like density, specific heat, thermal conductivity, absorptivity, need to be adjusted until the experimental results are coincident with the simulated one and the error between them is the same as the experimental error. These results build the simulation foundation for the next thermal fatigue test. References for the selection and optimization of the model parameters of other partials in thermal fatigue test are also provided.