Photoelectron spectro-holography, represented by differential photoelectron holography and multi-energy X-ray photoelectron diffraction, is a new technique to investigate the structures of surface and interface. Using photoelectron holograms effectively, differential photoelectron holography reconstructs more precious atomic images than other photoelectron techniques, while multi-energy X-ray photoelectron reveals the structures of surface and interface in wide depth range from adsorbates to buried interfaces. In this article, the principle, instrument and recent results of photoelectron spectro-holography method are overviewed briefly.