Among the megacities, Chengdu ranks first in the public transportation service index, which is 0.610. Its advantage lies in the two aspects of the open level of public transportation connected by rail. However, due to the average distance of public transportation in small and medium-sized cities is generally higher than that in large cities, the construction of thin public transportation is difficult to achieve efficient street connection for different public transportation, and the public transportation travel service index is relatively low. Through the product, the modular design of urban buses is fully and reasonably utilized, the city carries out pain point design for resource utilization, and the rationalization of urban transportation pressure resources is greatly solved through two different operation modes of public buses.