With the popularity of the Internet in the lives, while researchers are enjoying the convenience brought by the Internet, researchers may also find that the personal information are becoming increasingly vulnerable to theft, and then is quickly spread and abused, causing a serious violation to the privacy. This paper researches the problem of online personal information security reflected by the “Prism” to elaborate on the causes and damages of risks to online personal information security, analyze disclosure of online personal information and illustrate protective measures towards online personal information security while combining the two-factor authentication technology. Keywordsnetwork; personal information;security risks; information disclosure; two-factor authentication technology