Microblowing technique as an active flow control technology, has increasingly become a research hotspot due to its significant effects in reducing drag and heat. However, the impact of micro-blowing on the energy transport process in turbulent boundary layers still requires further investigation. Direct numerical simulation methods were employed to study the boundary layer of a transpiration plate at Ma 7.3 under different blowing intensities. The study found that the transpiration blowing can significantly reduce the surface heat flux in the turbulent boundary layer. As the blowing intensity increases, the streamwise and normal turbulent heat transport processes are quadratically enhanced within the boundary layer. Furthermore, a fitting formula for the turbulent heat transport as a function of blowing intensity was derived. The findings of this study can be expected to provide important theoretical reference for the aerodynamic configuration and drag/heat reduction design of high speed vehicles.