Industrial convergence has been widely concerned by scholars as an effective way to promote industrial upgrading and development. Transportation industry and postal industry have the advantages of wide coverage, strong penetration ability and obvious driving effect. The deep cooperation between the two industries makes the modern comprehensive transportation system more intensive and efficient. Based on this background, this paper constructs a Logistic model for the integration and development of transportation industryand postal industry, analyzes the stable point of the model and the driving force under the symbiotic state. After that, this paper selects the time series of Chongqing from 1997 to 2016 for empirical analysis.The analysis identifies the symbiotic mode between the two industries in Chongqing, and innovatively calculates the driving force between the two industries. The conclusion shows that there is a strong correlation between the transportation industry and the postal industry in Chongqing. The growth of the transportation industry has entered a period of low-speed growth, and the postal industry still maintains a high-speed development trend. Under the current social and economic conditions, there is an asymmetric and mutually beneficial symbiotic relationship between the two, which can closely promote industrial integration but not in the optimal symbiotic mode. Based on the conclusion of the study, this paper puts forward some feasible suggestions for the integration and development of Chongqing's transportation industry and postal industry which will promote the transformation of the two major industries into a more stable and efficient symbiotic mode, thus driving Chongqing to establish a modern first-class comprehensive transportation system.