The information carried on the optical field was encoded to the time-bin qubit in the rubidium atomic band, and then the time-bin qubit was transmitted in the fiber for 2.3 km. The time-bin after transmission wasmeasured by the non-equilibrium Mach -Zehnder interferometer. The experimental results showed that the coherence retention of time-bin in the long distance transmission about one photon was 81%. Quantum network is a major research target in the field of quantum information. Scientists have tried to construct quantum networks using a variety of trapped ions, atoms, and quantum dots as nodes. Rubidium atoms of the alkali metal is a strong candidate for quantum nodes due to the good coherence and long coherent time of ground state spin waves. The entanglement of atomic spin wave and Stokes photon generated by spontaneous Raman process is very suitable for quantum network. The light - atomic quantum interface based on spontaneous Raman scattering has beendemonstrated experimentally. We have carried out an experimental research on the transmission of time-bin qubits in rubidium atomic band.