We　numerically　simulate　a　photonics　phenomenon　of　what　we　call　intensity　inversion　between　red　and　green　fluorescence　in　oxyfluoride　nanophase　vitroceramics　Er(1%)Yb(8%):FOV　through　the　integration　of　whole　fluorescence＇s　theories.　We　found　that　it　is　essential　to　introduce　a　coefficient　presenting　the　difference　between　the　Stokes　energy　transfer　and　anti-Stokes　energy　transfer　processes　in　nano-material　when　calculating　the　energy　transfer　rate.　Under　this　consideration,　and　with　the　total　crystallized　volume　ratio　set　to　be　17.6%,　the　simulation　results　of　the　population　probabilities　values　of　all　energy　levels　of　Er3+　ion　are　coincident　with　the　experimental　result　perfectly.