With the development of the Internet, the process of computer software globalization continues to push forward. For widely used software, anidentical binary code is installed on millions of computers; sometimes even hundreds of millions. This makes widespread exploitation easy and attractive for an attacker because the same attack vector is likely to succeed on a large number of targets. Traditional software security methods can only counter the threat temporarily, and cannot eliminate essential vulnerabilities. This paper proposes a scheme of combining software diversity with mimic defense in the software security industry.