On the basis of the finite difference software -FLAC3D, this paper compiles program using its FISH language to simulate the effects of shield tunneling on bearing capacity of a single pile. Considering the soil pressure in the soil chamber, grouting in the shield tail, and grouting with two phases of clotted and not clotted states. The bearing capacity of a single pile is analyzed during shield tunneling. Influential factors to the single pile by shield tunneling consist of skin-friction resistance and tip resistance of a pile. The influence on the pile bearing capacity is also analyzed as changing of propellant force of the face of excavation. It shows that negative skin-friction of pile would occur at the bottom of the pile, which could decrease the bearing capacity of the pile. The bearing capacity of a pile changes with varying the soil pressure in the soil chamber.