As a representative subway construction method, the pile-beam-arch approach has been widely used in actual projects. However, there is no calculation method for the foundation bearing capacity of bar foundations of the pile-beam-arch approach. The idea of solving this problem is proposed for the first time, and the problems of the existing calculation method are illustrated by simulating the actual station project, on the basis of this, examining the role of neighboring strip foundations in influencing. The conclusions show that: (1) The existing calculation method does have the problem of conservative results; (2) There is an influence of adjacent bar foundations on the foundation bearing capacity; (3) The study proposes a new concept of the foundation bearing capacity increase coefficient, which can quantify the influence of adjacent bar foundations, and derives a calculation method more suitable for the foundation bearing capacity of pile-beam-arch approach stations. The research results not only provide a new way of thinking for the calculation of foundation bearing capacity of stations with the pile-beam-arch approach, but also have a certain reference significance for similar projects.