改进改型即对飞机进行技术改造,是军用飞机改进发展的常用作法。但是,进入90年以后,这种作法倍受重视,已成许多国家的空军(包括海军和陆军航空兵)更新装备的重要途径。本文根据大量事实,对改进改型在军机发展中的重要作用和近年来倍受重视的主要原因作了较为详细的介绍。 Improving retrofitting means that the technological transformation of aircraft is a common practice for improving the development of military aircraft. However, this approach has gained prominence 90 years later and has become an important means of updating the equipment of the air forces of many countries, including the navy and army aviation. Based on a large number of facts, this article gives a more detailed introduction of the important role of improving retrofits in the development of military aircraft and the main reasons why they have received much attention in recent years.