A　dual-plane　in-line　digital　holographic　method　is　proposed　with　a　liquid　crystal　on　silicon　(LCOS)　spatial　light　modulator　(SLM)　for　recording　holograms　at　two　slightly　displaced　planes.　The　computer-generated　chirp-like　complex　reflectance　is　displayed　on　the　LCOS　SLM　to　adapt　the　object　beam　at　two　planes　for　recording　two　holograms　processed　to　eliminate　the　DC　term　and　twin　image　accurately;　no　mechanical　components　or　manual　operation　during　data　acquisition　is　required.　The　proposed　approach　improves　the　speed,　accuracy,　and　stability　of　the　experiment.　Computer　simulation　and　experiments　for　both　amplitude　and　phase　objects　are　carried　out　to　validate　the　proposed　method.　(C)　2014　Optical　Society　of　America