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In order to study the influence of foundation pit construction on the deformation of underlying tunnel structure, MIDAS is used to calculate the deformation of tunnel structure under different excavation size and excavation sequence, and the tunnel structure is monitored in real time. The results show that when the upper part of the foundation pit is constructed with different block sizes, the vertical deformation of the tunnel structure increases with the increase of the block size of the foundation pit, and the horizontal deformation of the tunnel structure first decreases and then increases with the increase of the block size of the foundation pit; In the process of foundation pit construction, the foundation pits on both sides of the tunnel are constructed at the same time, which has the most advantage to control the tunnel structure deformation; because the tunnel structure is obliquely intersected with the excavation foundation pit in the longitudinal direction, the horizontal deformation of the cross section of the tunnel structure close to the foundation pit sideline is larger. The numerical simulation better reflects the actual deformation trend of the tunnel structure. Affected by the selection of construction parameters, the measured deformation data of the tunnel structure is significantly smaller than that of the numerical simulation value. [ABSTRACT FROM AUTHOR]