Wireless sensor networks（ WSNs） is a widely applied multi-hop Ad Hoc networks

it is composed of hundreds of resources limited sensor nodes. When data is transmitting

if traffic load of node exceeds its available bandwidth

congestion will occur

so that transmission is unreliable. This is especially true in special work environment in WSNs

when there are malicious nodes

will be more serious. Introduce game theory

research on WSNs with presence of malicious node research

analyze behavior of nodes

establish game model

implementation steps and verification scheme are given

synthesize theoretical analysis and simulation results

get the optimal strategy of node

achieve goal of network congestion avoidance.