Abstract: An experiment system of phase-shifting digital holography was designed which uses the digital object produced and controlled by spatial light modulator (SLM) in light path of phase-shifting digital holography; and the records of digital holograms of digital object displayed on SLM and the reconstruction from digital holograms were realized. Experiment results reveal that the phase-shifting digital holography is better than the digital holography, and the phase-shifting digital holography based on SLM will open more space for the phase-sifting digital holography in future, because it has many characteristics such as digital objects, variable parameters, moving objects, etc.