Photoelectron outgoing wave emitted from core state of excited atom will be scattered by near neighbor atoms.Scattered waves (object waves) which contain structural information of the environment around the excited atom interfere with the original one(reference wave)which propagates directly to the detector,and then a diffraction pattern,i.e.a photoelectron hologram,will be created.A complete 3 D image of the structure surrounding the emitter with at omic resolution can be reconstructed.This paper gives computer simulation for ca lculat ing photoelectron holograms of small atomic clusters on c(2×2) S/Ni(100) surface,in metal copper,and on puckered Cu2O plane of superconductor YBCO.