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A novel setup of saturated absorption spectroscopy (SAS) is presented.It is based on laser reflections at surfaces of a sample vapor cell.It only needs one cell and one photodiode and is more compact than conventional setups of SAS.Its spectrum is similar to a conventional SAS.The frequency stabilization performance of an exteal-cavity diode laser with this setup is investigated.A frequency stability of 1.1 × 10-11 is achieved at an averaging time of 60s in the Allen variance measurements.