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Traffic congestion identification design based on vehicle electronic tags is proposed. The reader which is installed on the road back to back, is used to avoid the interference from the reverse drive vehicles. And the Active electronic tag is used to expand the range and accuracy in reading and writing. In scanning of electronic tag range, the number of vehicle electronic tags, the tag’s update ratio and the travel time are obtained. In order to identify traffic status and the congestion state, the control system and the linkage of the on-board electronic tag system with the intersection light condition is established. The simulation environment is built by VISSIM with secondary development. Simulation result shows that the present methods can effectively discriminate traffic states and the average accuracy is above 85%.