Abstract: In order to make the circular foil heat flux sensor meet the ever-developing needs of dynamic heat flux monitoring in extreme environments such as hypersonic wind tunnels, a heat flux dynamic calibration platform was constructed by adopting a high-power semiconductor laser as the heat flux source, and the laser beam energy generated by the system was measured and analyzed to ensure the scientificity and reasonableness of the subsequent experiments. The system generates heat flow densities in the megawatt per square meter class with pulse excitation widths in the millisecond class. The relationship between the time constant measured by the Gordon gauge and the excitation laser parameters was investigated through dynamic response experiments. The results show that the time constant is negatively correlated with the laser power and pulse width within a certain range. When the laser pulse width is less than one order of magnitude near the sensor time constant, it can be regarded as an ideal pulse excitation. The linear relationship between the laser parameters and the generated heat flux is also obtained, indicating the feasibility of using the laser method for test calibration. The related research content provides a reference for the dynamic calibration of sensors using the laser method.