This paper puts forward a security-ring model for network information flow based on human social intelligence.The model controls the dynamic security of network information flow on four layers: Security entrance layer requires user authentication and encapsulates security information flow;Social intelligence layer makes information flow to have the ability of self-sensing self-protecting and self-adjusting;Business layer carries out business logic in forms of transactions which can be submitted

processed and roll back

in order to provide real-time protecting and online recovering;TCP/IP security layer ensures security communication for information flow.These four security layers corporately run to build different grades of security-rings.By establishing mathematics model and reasoning

it is verified that the model can effectively guarantee dynamical security of network information flow and provide a feasible method for the whole business security.