The　oscillation　feature　of　the　holographic　grating　at　the　initial　phase　of　two-center　holographic　recording　in　double-doped　LiNbO3:Fe:Cu　crystal　was　investigated.　The　oscillation　behavior　could　be　attributed　to　the　transfer　of　electron　distributions　in　the　deep　and　shallow　trap　centers　of　the　double-doped　crystals　at　the　initial　phase　of　recording,　from　the　initial　distribution　of　just　finishing　a　pre-exposure　with　UV　light　to　another　equilibrium　distribution.　In　experiments,　the　effect　of　doping　concentration　ratio　and　the　intensity　ratio　of　recording　beams　to　UV　light　on　oscillation　characteristics　was　explored.　The　results　show　that　the　strength　and　the　duration　of　the　oscillation　are　dependent　on　doping　concentration　of　the　shallower　trap　in　crystals　and　the　intensity　ratio　of　total　recording　beams　to　UV　light.