Thermal-fixing　holographic　storage　in　photorefractive　crystals　is　an　effective　nonvolatile　storage　technique　for　stabilizing　holograms　against　the　optical　erasure.　The　developing　characteristics　of　fixed　holograms　in　iron-doped　lithium　niobate　dominate　their　final　diffraction　efficiencies　after　developing,　provided　that　the　ionic　compensation　in　the　fixing　stage　is　nearly　complete.　Developing　kinetics　of　fixed　holograms　under　homogeneous　illumination　is　studied.　The　effect　of　developing　light　intensity　on　developing　efficiency　has　been　demonstrated　experimentally.　The　fixed　holograms　with　the　same　initial　recording　grating　strength　are　developed　under　illumination　of　the　different　light　intensities,　such　as　200mW/cm(2),　400mW/cm(2),　600mW/cm(2).　and　800mW/cm(2),　respectively.　The　fixed　holograms　with　the　different　initial　recording　grating　strengths　are　developed　under　illumination　of　the　same　light　intensities　as　well.　The　overdeveloping　characteristics　of　fixed　holograms　are　described.　The　developing　efficiency　of　the　hologram　with　a　given　initial　recording　grating　strength　is　found　to　depend　on　the　intensity　of　developing　light.　These　features　can　be　explained　with　the　joint　effect　of　the　resulting　space-charge　holographic　field　of　the　fixed　hologram　and　the　photovoltaic　field　under　homogeneous　illumination.