When crossing active ground fissure diagonally, subway tunnel is in the complex stress state of bend, shear as well as torsion. According to outstanding torsional deformation and failure of physical model test for box tunnel, based on the theory of thin-walled under constrained torsion and combined with box tunnel diagonal crossing active ground fissure of the actual stress situation, the torsion angle and shear stress analytical solution of box tunnel lining structure under concentrated torque and uniform friction torque on surface were proposed. By using ANSYS, box tunnel lining structure and torsion deformations finite element model was established. And the torsion angle cross-section and the maximum shear stress were analyzed. The torsion angle and the maximum shear stress from the result of numerical simulation and analytical were in good anastomosis.