Abstract: It is difficult to guarantee the reliability and real-time ability of data. This article proposes a "Black Box" solution, based on software Re-engineering that is becoming the main tendency of software engineering. The solution is realized by embedding software Re-engineering into development supported system. Re-engineering project management data is collected by recording all changes of program inside automatically. The article introduces an instance using this solution, which has gotten the copyright of China, and been verified to be effective in some projects of Re-engineering.