Complexity Research Based on Public Transport Network of Tianjin

In order to conduct research on pubic transport network of Tianjin and analyze its robustness,three types of complex network are constructed based on complex network theory in this paper.Methods are to study the network topology parameters.The results include: all the three types of network model have small world effect properties,and average path change rate,weight of bus stop are derived from these three complex network.And average shortest path equals 16.2,average path change rate is 2.12 times,average ride time is 78.7 minutes.The conclusion is that the topological structure of the transport network is unreasonable,so it's need to improve the efficiency.According to the requirements of robustness,the paper proposes further improvement and optimization methods.