Abstract: This paper studies the code structure characteristics of mixed source software,according to four standards,which include function knowledge,code usefulness,code security and intellectual property rights.This shows the unique code space of mixed source code.This paper analyzes the positive and negative effects of open source components on the progress,quality,cost and intellectual property rights of mixed source projects.The licenses are divided into three types according to their infectivity.Through the case study of open source component in the safety critical field software project,the basic situation of open source application is shown,and the problems existing in the practice are analyzed.Based on the above research,this paper brings forward that the whole life cycle management mechanism of open source components,and the innovation based on open source should be strengthened,and encourage integration and feedback to the open source community,from the technical view,we should make careful component selection,strengthen product development process management in the early stage of the project,and closely follow the open source community to product evolution.These can help to make better use of open source component and promote software mixed source project management.

Key words: License, Mixed source software, Open source software component