3D terrain shading technology is one of the important technologies of airborne Synthetic Vision System (SVS),traditional texture mapping requires a large number of texture database storage resources,and the ray-tracing based global illumination model has high requirements for embedded software and hardware resources.To solve this problem,an airborne SVS terrain shading method based on the improved BlinnPhong illumination model is designed,the illumination model is improved,and the vertex color mapping and normal vector calculation algorithms are optimized.The simulation test results show that the improved method has significantly lower storage and memory usage than texture mapping,and the improved method is better than the method before the improvement in terms of CPU usage,GPU usage and display frame rate,and is suitable for the application scenarios of airborne SVS.