The　dynamics　of　the　image　quality　reconstructed　from　holographic　photopolymer　is　experimentally　investigated.　In　experiments,　the　intensity　and　quality　of　reconstructed　images　are　monitored　during　dark　enhancement　and　uniform　post-exposure.　The　quality　of　reconstructed　images　is　quantitatively　evaluated　based　on　the　loss　of　signal-to-noise　ratio.　The　experimental　results　show　that　the　intensity　and　quality　of　reconstructed　images　suffers　from　non-monotonic　changes　during　dark　enhancement　and　uniform　post-exposure,　that　is,　increases　at　first,　but　decreases　later　from　the　highest　value.　These　experimental　results　can　be　explained　by　the　formation　and　development　of　noise　gratings.　The　tolerance　of　image　quality　on　uniform　post-exposure　and　dark　enhancement　is　evaluated　based　on　the　characteristic　time,　at　which　the　signal-to-noise　ratio　of　reconstructed　images　decreases　a　half　of　the　original　value.　The　experimental　data　show　that　during　the　characteristic　time,　both　of　quality　and　intensity　of　reconstructed　images　are　acceptable.　In　multiplexed　holographic　storage,　the　dynamics　of　image　quality　should　be　considered　in　order　to　ensure　uniform　diffraction　efficiency　and　good　quality　to　all　holograms.