【Purpose/significance】In the era of mobile social network,it has become a living habit of people to transmit and publish information at anytime and anywhere.The characteristics of the instant and super space-time of the mobile social network also make the network public opinion further escalated.【Method/process】The system dynamics model of mobile social network public opinion is constructed, and Vensim PLE software is used to simulate and simulate the example.【Result/conclusion】The result shows that the social network public opinion is influenced by the public opinion events,media, mobile Internet users and government, the reducing of sensitivity, the communication number of mobile social platform, the emotional strength of users and the enhance of government information transparency can effectively deal with mobile social network public opinion.