We　present　a　method　of　fractional　Fourier　transform　digital　holographic　recording　by　setting　an　extended　Lohmann　I-type　optical　setup　in　the　object　arm　of　a　typical　off-axis　digital　holographic　recording　system.　In　the　experiment,　the　resolution　and　the　field　of　view　for　the　reconstructed　images　of　a　fractional　Fourier　transform　holograms　and　an　image　plane　hologram　are　investigated.　When　the　lens　focal　length　meets　a　certain　condition,　the　reconstruction　imaging　resolution　of　fractional　Fourier　transform　holograms　is　higher　than　that　of　conventional　image-plane　holograms.　The　reconstruction　results　demonstrate　that　the　reconstructed　images　of　the　fractional　Fourier　transform　holograms　have　the　higher　imaging　resolution　when　the　fractional　order　p　is　closer　to　1.　©　2023　SPIE.