  With the passage of time, the development of communication technology and
transportation broke the isolation among people. Relationship tends to be
complicated, pluralism, dynamism. In the network where interpersonal
relationship and evolved complex net based on game theory work serve
respectively as foundation architecture and theoretical model, with the
combination of game theory and regard public welfare as influencing factor, we
artificially initialize that closed network system. Through continual loop
operation of the program, we summarize the changing rule of the cooperative
behavior in the interpersonal relationship, so that we can analyze the policies
about welfare system about whole network and the relationship of frequency of
betrayal in cooperative behavior. Most analytical data come from some simple
investigations and some estimates based on internet and environment and the
study put emphasis on simulating social network and analyze influence of social
welfare system on Cooperative Behavio.
