Abstract: A simulation method of shield tunnel segment floating includes steps of dividing a flow field into grids, obtaining numbers and center coordinates of control bodies, and setting flow field boundary conditions; initializing flow field parameters and calculation parameters; updating the area velocity of the control bodies in the current time step; discretizing the flow field control equation, and solving iteratively the flow field velocity and pressure; updating the velocity and position coordinates of the boundary discrete points; obtaining the velocity of the boundary discrete points, calculating the force generated by the boundary discrete points and discretizing the force to the whole flow field; and finally transmitting the velocity of the boundary discrete points, the force applied to each unit of the flow field, the force applied to the boundary discrete points and the updated slurry viscosity in the current time step to the next time step.