文章简要论述了航空发动机发展的两种途径及其特点，从国内外航空发动机改进发展广泛采用的作 法和成功的经验事例，论证了“渐改”发展模式的规律性和重要性，提出了对发动机改进发展应加强组织领导和计划落实的建议。

Two ways to develop the aero-engines and their respective features are discussed in a summary manner. The regularity and importance of the mode of step by step development are discussed and justified with reference to the practices widely used at home and abroad for improving and developing aero-engines and to the experience therein, and a better organization and direction for improving and developing aero-engines are suggested to implement the planning of them.