Crossing-river tunnel of Fuxingdong road in Shanghai City is the first twin-tube and double-layer tunnel in China. The full length of the project is 2 785 m and the outer diameter of tunnel lining structure is 11.22 m. Based on this tunnel,a 3D elastoplastic finite element model of twin-tube shield tunnel,which bears water pressure,was developed. The general software,Marc,is adopted to build the finite element model and simulate a 90 m long tunnel section,whose diameter is 11 m. Drucker-Prager material model is used as the strength criterion for soil. Soil mass in a same layer is considered as an isotropic body based on the geological condition that the soil is basically homogeneous,and is horizontal layered. In the modeling,water pressure is applied as load acting on the upper soil layer¢s surface of the model. Models simulating various circumstances with different tunnel distances are analyzed,on which the researches emphases the influence rules of subsequent tunnel to antecedent tunnel through analyzing the following indices:settlement of ground surface,axial force and moment of lining,soil pressure of lining and diameter deformation of different direction. Reasonable tunnel distance is drawn,which can be a reference to optimal design of similar projects. During the construction,the internal force of lining,soil pressure of lining and displacement of key issues of antecedent-building tunnel are monitored. To verify the validity of the finite element model,monitoring and computing results are compared and analyzed. The significant results obtained provide a better understanding of excavation process of twin-tube tunnel,and it is helpful in guiding future design and construction in similar conditions.