In　this　paper,　a　hybrid　method　of　in-line　and　off-axis　digital　holography　is　proposed.　Off-axis　digital　hologram　and　in-line　hologram　are　recorded.　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　phase　retrieve　of　in-line　hologram.　For　static　objects,　the　proposed　method　can　be　implemented　with　a　single　laser　and　dual　shots.　For　dynamic　objects,　it　can　be　implemented　with　dual-wavelength　lasers　and　a　single　shot.　It　can　achieve　high-resolution,　wide　field-of-view　holographic　imaging.