Taking an interval tunnel in Shenzhen as the research background, the influence of crack location, crack depth and crack width on the force of lining structure is studied by using the structure-load model. The calculation shows that the appearance of cracks causes the stress redistribution of the structure. When the crack occurs at the vault, the bending moment and shear force of tunnel lining are symmetrical and antisymmetric respectively, When the cracks occur at the spandrel, sidewall orarch foot, the bending moment of lining structure changes from approximate symmetry to asymmetry with the increase of crack depth. The maximum bending moment diffuses from the invert to the vault, and the maximum negative shear force appears at the left arch foot, and the maximum positive shear force appears at the right arch foot or left arch shoulder. With the increase of crack width, the bending moment and shear force at the typical position of lining decrease, when the crack width expands from 5 mm to 10 mm, the effect on the stress structure is most obvious. With the change of crack depth and width, the position of the most dangerous section of tunnel lining also changes. It is necessary to strengthen the monitoring of different parts of the tunnel, analyze and judge the development of cracks to ensure the safety of personnel and equipment. This study can provide guarantee and guidance for the safe construction and healthy operation of practical projects.