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With the accelerate development of information, enterprises are becoming increasingly dependent on information systems, therefore, ensuring information security becomes the core work of enterprises information management. The tradition risk factors are classified into three aspects of asset, vulnerability and threat. This paper adds the security prevention measures as the fourth aspect. After analyzing the four aspects based on the fuzzy set theory, then constructs the membership matrix ofdoi:10.12783/dtem/icem2017/13132 fatcat:v2bmlx5cwzdkzfqhnp7vefr77y