Based on the principle of x-ray fluorescence holography, we numerically simulate d an iron single crystal model of a body-centred cubic lattice. From the fluores cence hologram produced numerically, the Fe atomic images were reconstructed. Th e atomic images of the (001),(100),(010) crystallographic planes were consistent with the corresponding atomic positions of the model. The result indicates that one can obtain internal structure images of single crystals at atomic-resolutio n by using x-ray fluorescence holography.