Software engineering is the application of computer science, mathematics, logic and management science and other principles, the development of software engineering. Software engineering USES the principles and methods of traditional engineering to improve the quality, reduce the cost and improve the algorithm. Among them, computer science and mathematics are used to build models and algorithms, engineering science is used to develop norms, design paradigms, evaluate costs and determine trade-offs, and management science is used to manage plans, resources, quality and costs.