Top hypersonic aerodynamic heat simulation technology is one of the important supports for improving the heat protection capability of antennas. To further shorten the development cycle and save costs, this article proposes an engineering algorithm that uses cold wall heat flux and wall surface recovery enthalpy as input conditions, and utilizes MATLAB and CFD joint iterative rapid solution method to quickly solve the antenna temperature field in high-speed airflow. After confirming the high consistency between simulation results and experimental data through aerodynamic heat tests, this simulation method was used to perform heat insulation optimization design for an antenna with a high-speed aerodynamic heating duration of 500 seconds. Based on the primary and secondary factors identified through simulation that cause temperature rise of the core device, targeted improvement measures were proposed. The final target printed circuit board temperature was reduced from 320 ℃ to 142 ℃ with significant thermal control effects.