Recently, the Chinese Academy of Sciences, Shenyang Institute of Automation Photoelectric Key Laboratory of Information Processing Infrared fairing research results "based on the SST model infrared fairing turbulent heat transfer numerical calculation" won the "Infrared and Laser Engineering" 2016 the seventh cover . Spherical fairing of low-altitude high-speed aircraft usually works in the state of turbulent heat exchange. Based on the zero-angle cone, researchers in Shenyang Automation combined with the structural grid to calculate the engineering parameters of flow parameters, stagnation points and turbulent spherical heat exchange, explored An engineering method of applying SST model to the numerical calculation of turbulent heat exchange in a fairing is presented. Based on Billig's formula, the researchers first constructed a shunt grid in the flow field to reduce the numerical dissipation, and then analyzed the sensitivity of the calculated results to the near-wall grid by adjusting the height of the grid. Based on this, the influence of SST model parameters on the calculation results is analyzed. Among them, the Bradshaw number only affects the peak heat flow significantly. In stagnant laminar flow region, the heat flow calculation results of SST model accord with Klein formula through the correction of equivalent thermal conductivity of incoming flow. In the spherical turbulence region, the Bradshaw number is corrected by using the high-speed turbulent heat transfer equation of the sphere, and the heat flow calculation result of the SST model is in accordance with the engineering algorithm. The results of the modified SST model have engineering accuracy, which can be used for analysis and study of the thermal shock resistance of the fairing, aerodynamic optical effect and image non-uniform correction, and have important engineering significance.