[Purposes] This paper aims to cover blind spots in urban transportation networks, improve the overall efficiency of urban transportation systems, reduce traffic congestion, and address the “last mile” travel challenge for residents. [Methods] First, from the perspective of balancing the interests of bus enterprises and passengers, the model of microcirculation bus networks was built with two objectives of maximizing the travel demand of passengers in the region and minimizing the system cost, considering factors such as the maximum operating length, maximum one-way operation time, and departure frequency of microcirculation buses. Then the optimal microcirculation bus network was solved based on the genetic algorithm, and an example analysis was conducted. [Findings] The travel demand of microcirculation bus routes is 23.0% higher than that of conventional bus routes, and the per capita travel cost is reduced by 6.11 yuan, which indicates higher service efficiency of microcirculation bus routes. [Conclusions] In residential areas where road conditions are restricted, microcirculation bus routes demonstrate operational advantages, significantly enhancing residents′ commuting convenience. This holds crucial significance in promoting urban sustainable development and the future development of public transit-oriented cities.