As the the rapid growth of city economy, a traffic congestion
has become a common sight in almost every big city. On the surface, the infrastructure
construction is incompatible with the rapid expansion of the city cars. In fact,the
root cause lies in the careless and easy style of management of traffic which
leads to the low traffic efficiency. This study mainly describes the traffic
system, the causes of traffic congestion, discussing on the optimization to
the network traffic, thereby reducing traffic congestions.