Based on the research progress in related fields and the distribution characteristics of road networks in PurbaMedinipur, the complex network model of a city road network is established to study its connectivity reliability. Purba Medinipur as the example, several parameters of the complex network abstracted from the road network are calculated and the practical meanings of them are described, respectively. The detailed investigation of connectivity reliability of PurbaMedinipur district road network is done by analyzing the curves’ tendency. Finally, we find that the network of a valley city has a poor connection and has a lot of dead ends. Besides, the average length of the roads is very long and the holistic connectivity reliability is at a lower level; these are suitable to the group-type distribution of road network, and the connectivity reliability of the road network is stronger under random attacks than that under intentional attacks.