Abstract: This paper analyses the different effects that the communication has on the measure of mass unexpected incident in the different developing phases using evolutionary game theory.It educes the evolutionary functions that mass unexpected incident is in the system crisis phase and transforming phase using the generalized replicator dynamics model,that degenerate to the infection diffusion function including learning obstacle.It analyses the effect that governmnt takes opening communication measure in the different phases,through making strategy-specific barriers to learning endogenetic disposed that is the funetion of the opening communication degree.It draws the conclusion that government needs to control the opening communication degree in the system crisis phase,and duly open communication in order to lead different social estates to engender the new cognizing equilibrium in the system transformaing phase.

Key words: communication, evolutionary game, mass unexpected incident, generalized replicator dynamics, social weak population