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With the development of security system information degree and protection capability format, it is important to evaluate its effectiveness precisely to prevention and control of social order based on these changes. According to the operational characteristics of security system, protection format is divided into personal protection, physical protection, and electronic protection. Effectiveness evaluation theory is used to measure how the risks were in each protection capability format. Meanwhile a method is put forward to evaluate security system effectiveness, then the conclusion is clear that security system risk is not directly proportional to protection capability, but the speed raising process of “fast-slow-down-stable 0”.