The　traditional　phase　retrieval　of　in-line　digital　holography　is　invalid　to　eliminate　the　twin　image　and　to　get　accurate　phase　when　the　object　does　not　conform　the　sparsity,　while　the　resolution　of　the　off-axis　digital　holography　is　low　due　to　the　limitation　of　the　minimum　of　the　recording　distance.　An　in-line　and　off-axis　hybrid　digital　holography　is　proposed.　The　off-axis　and　in-line　holograms　are　recorded　respectively.　The　approximate　phase　distributions　in　the　recording　plane　are　obtained　by　constrained　optimization　approach　from　the　off-axis　hologram,　and　they　are　used　as　the　initial　value　in　the　iterative　procedure　of　the　reconstruction　of　the　in-line　hologram,　then　the　high　quality　amplitude　and　phase　images　are　reconstructed.　The　ideal　resolution　of　the　hybrid　digital　holography　is　analyzed.　The　experimental　results　show　that　the　proposed　method　can　utilize　the　full　spatial　bandwidth　of　the　image　sensor,　it　can　realize　a　large　field　of　view　and　high　resolution　digital　holographic　imaging　without　the　interference　of　the　twin　image　when　the　objects　have　complex　shape,　and　the　resolution　in　the　experiments　approach　the　ideal　resolution.　©　2018,　Chinese　Lasers　Press.　All　right　reserved.