The weights of influencing factors of shield tunnel segments uplifting during construction are studied by equivalent beam model. The lining ring of a Metro shield tunnel in Nanning is simulated by equivalent stiffness Euler beam; the interaction of the soil and tunnel is simulated by equivalent spring; the model is calculated by software Matlab. The calculation results are compared with measured data so as to verify the rationality of the model. The weights of influencing factors are calculated by sensitivity analysis method. The orders of weights of influencing factors are the length of area with unconsolidated grout, grout pressure, deformation modulus of ground, effective rate of longitudinal bending rigidity and vertical force of total thrusting force. The acting mechanisms of influencing factors are analyzed; and then some countermeasures are proposed.