Abstract: During construction, when auxiliary structures such as air ducts are transferred to the station main structure construction, the connection between them experiences complex forces and the construction faces significant challenges. Therefore, it is necessary to study the technical solutions of air duct to main tunnelintroduction scheme at metro station and an appropriate interface form is selected to ensure the quality and safety of the construction project.Method: Taking a station project of Qingdao Metro constructed by archcover method as an example, the finite element model of air duct interface is established using MIDAS GTS software. With reference to fieldmeasured data, the ground displacement and support structure stress of the following schemes are comparatively analyzed: air duct elevated halfsection entry scheme, air duct elevated fullsection entry scheme, air duct depressed halfsection entry scheme, and air duct depressed fullsection entry scheme.Result & Conclusion: Among the two depressed schemes and the two elevated schemes, the maximum vertical displacement of the former is 8.40 mm, while the maximum vertical displacement of the latter is 21.70 mm, about 2.6 times higher. After the construction is completed, the final vertical displacements are 1.34 mm for the depressed schemes and 10.50 mm for the elevated schemes. In the former, the final vertical displacement is 1.42 mm for the fullsection entry scheme and 1.26 mm for the halfsection entry scheme. Considering the stress analysis results of support structures for four schemes, the depressed fullsection entry scheme exhibits lower support structure stress while meeting the strength requirements, making it the optimal solution.