This article introduces several principles of software improvements, describes the improvements we have done in the ALGOL compiler of computer DJS-6 made in China, and points out the problems of software improvements existing in our country.

• 本文提出了软件维护中的几个原则问题,叙述了我们对国产DJS-6机ALGOL编译所作的维护与改进工作,并指出了我国软件维护中存在的问题。