Abstract: Taking certain overlapping tunnel-group metro station as example, a three-dimensional finite element model of the interaction system between the surrounding rock and the tunnel-group metro station is established, focusing on the analysis of the station weak parts under seismic motion and the investigation of seismic response at link passage connecting part in station. The structure lateral section and stiffness sudden change at each link passage connecting part is demonstrating weak performance in underground structure seismic resistance. Results show that the spandrel at the connecting part between the hall tunnel and the hall-platform link passage, and the arch bottom at the connecting part between platform-platform link passage and platform tunnel are the weak part in aseismic performance. The section A of platform-platform link passage 4 and the lower section of hall-platform link passage is the unfavored part of structure bearing force. The ground motion spectrum has a great influence on the internal force response of tunnel connection.