Reasonable control of grouting parameters is of great significance in limiting the surface deformation and reducing the risk of tunnel construction. Relying on the shield tunnel project between T2 and T3 maglev stations, based on numerical simulation, the influence of grouting pressure, grouting quantity and slurry elastic modulus on surface deformation is studied, so as to get the reasonable grouting parameters to control the surface settlement, and to reduce the risk of excessive surface settlement caused by the irrational parameters of synchronous grouting of shield tunnel. The results show that the tunnel synchronous grouting has a significant effect on the ground settlement control, The greater the grouting pressure, grouting thickness and elastic modulus of grout, the smaller the ground settlement. As the values of three parameters increase, the surface settlement decreases, but the decrease rate will gradually approximate to zero, thus the stabilization of ground settlement reveals that the saturation of the grouting effect. Considering a balance between the effectiveness and economy of grouting, it is recommended to control the grouting pressure within the range of 200-250kPa, the grouting amount around 5.4m3/ring, and the elastic modulus of the slurry within the range of 200-250MPa.