Abstract: Abstrace: To further improve the heat dissipation ability of busbars in electric switchgear cabinets, a circular pulsating heat pipe with a diameter of 2 mm was installed on the surface of the B-phase busbar. Factors including the filling ratio of the pulsating heat pipe, air inlet velocity, and busbar load current were chosen for optimization experiments using the central composite design method. Based on experimental results, a multivariate linear regression model was established to describe the relationship between the average surface temperature of the B-phase busbar and these factors. Response surface methodology was applied to simulate and analyze changes in the average surface temperature of the B-phase busbar under different interactions among factors, optimizing the operating parameters of the pulsating heat pipe. The accuracy of the response surface methodology prediction was verified through temperature rise experiments. Results show that for electric switchgear cabinets with added pulsating heat pipes, the air inlet velocity, busbar load current, and their interaction significantly affect the average surface temperature of the B-phase busbar. When the load current is 853 A, air inlet velocity is 1.7 m/s, and the filling ratio of the pulsating heat pipe is 50%, the average surface temperature of the busbar reaches its lowest point, indicating the strongest heat dissipation capability. The mean values of the temperature rise experiment fall within the 95% confidence interval of the response surface, confirming the accuracy of the predictions made by the response surface methodology.