In order to make a case-based reasoning technology even more effective in the high-level anti-missile deployment at the terminal section, this paper studies construction and use of case library in the high-level anti-missile deployment at the final stage. Firstly, the organization and the construction of the case database are studied, i.e. the expression of cases, the organizational structure of the case database and the construction process of the case database. Secondly, the application of the case database is studied, i.e. core content of which retrieval is done and matching of similar cases is made, and the case analysis are given. Finally, the problem of streamlining the case library is studied. The research content is involved with most of the problems in the process of building and using the case library.