On the platform of jiayuan, users can get to know others and make friends by communicating with each other and making friends. In order to improve the credibility of the platform and users' sense of security, jiayuan introduced the marginal credit system. Marginal credit is a credit mechanism, which evaluates users' behaviors and interaction records on the jiayuan platform. Users' behaviors on the platform will be recorded and counted, including but not limited to publishing real information, actively participating in communication, respecting others and observing platform rules. According to the user's behavior, the platform will give corresponding credit evaluation, forming a credit rating or credit score.