As restricted by tunnel clearance, transportation vehicles size and safety distance, only single-orbit transportation can be used in construction of small section shield tunnel. With the increase of the tunnel in length, transport time within the tunnel has become a bottleneck restricting the construction time. By analyzing various factors influencing transportation within tunnels, this thesis put forward the solution of unit transport of two rings of segment and materials. Checking calculations of parameters such as adhesion quality, starting traction quality and braking distance of the locomotives chosen in the solution are also carried out in this thesis, with proposal of assistant measures ensuring transportation safety.