There　exist　some　ambiguities　about　the　depth　of　view　(DOV)　and　depth　of　focus　(DOF)　of　digital　holographic　imaging　system　(DHIS).　Based　on　the　principle　of　digital　holography,　the　DOV　and　the　DOF　of　the　DHIS　is　analyzed　in　detail　for　the　first　time　to　the　best　of　our　knowledge.　For　the　four　common　configurations　for　recording　digital　holograms,　the　axial　complex　amplitude　and　the　intensity　distributions　of　the　reconstructed　optical　field　of　a　point　object　are　deduced　respectively　using　Fresnel　diffraction　formula.　According　to　the　same　criterion　in　common　coherent　imaging　system　of　the　lens　(CCISL),　the　DOF　of　the　DHIS　is　obtained.　The　results　show　that　the　DOV　and　the　DOF　of　the　DHIS　are　related　not　only　to　the　optical　wavelength　and　the　numerical　aperture　of　the　CCD　camera　but　also　to　the　offset　of　the　reference　light　wave.　The　DOF　of　the　CCISL　is　found　larger　than　that　of　the　digital　in-line　holographic　system.　But　the　DOF　of　the　digital　off-axis　lensless　Fourier　transform　holographic　imaging　system,　which　is　depended　strongly　on　the　offset　of　the　reference　point　source,　may　be　larger　or　smaller　than　that　of　the　CCISL.　The　computer　simulation　results　confirm　the　validity　of　the　theoretical　analysis.