Abstract: In order to explore the influence of construction stress release on the internal water pressure bearing capacity of tunnel lining structure，taking the follow-up western channel project of expanding south row of Hangjiahu Lake as an example，a fine stratum-structure model was established by finite element method，and the stress and deformation law of single-layer segment lining of large-section hydraulic TBM tunnel under different internal water pressure and different construction stress release rates was analyzed.The results showed that the segment lining expanded outward under water pressure，and the tensile stress，joint opening and bolt stress of the segment increased in a step and nonlinear way with the increasing of internal water pressure.For the tunnel section passing through the V grade surrounding rock，the above three factors should be considered comprehensively to determine whether the lining reaches the normal service limit state，and the pressure difference between the inside and outside of the lining should not exceed 0.2 MPa.The weak position of the joint between the segment rings under the smaller construction stress release rate is easy to crack，and the joint opening and bolt stress under the excessive construction stress release rate are easy to reach the normal service limit state.