角度评估指数是传统空战优势评估的常用指数之一，对评估现代超视距空战仍然有重要意义。针对现代超视距空战的特点，提出了转向时间模型这一新的角度评估模型。通过空战机动转向过程建立起空战几何态势各因素间的关联。然后以转向时间模型分析典型的空战态势，并对模型完成简化。最终结合算例验证了转向时间模型的有效性。

The angle factor is a common factor in traditional air combat superiority assessment, which is of great significance for beyond-visual-range(BVR) air combat assessment.The turn-time model was presented as a new angle assessment factor based on the characteristics of BVR air combat, and the relationship between each geometric situation factor in air maneuverings turning process was founded in this model.The typical air combat situation was analyzed by using the turn-time model, and the model was simplified.Simulation was made according to the real condition and the result showed the validity of this new angle assessment model.