Along with the steady development of social economy and the unceasing enhancement of science and technology level, our country has made great progress in computer software engineering. Computer has achieved extensive application in people's daily life. But the rapid popularization of computer brings the risk of information leakage. It requires maintenance personnel to better understand and grasp the features of computer software, and maintain the computer software combining with the actual situation, so as to realize the healthy, stable and continuous development of computer software. This article discusses the importance of computer software engineering maintenance and puts forward the maintenance measures of computer software.