This paper researches the direct up-conversion sensitization luminescence of ErY b codoped oxyfluoride glassceramics(ErYb:FOV) excited by CW 966nm-diode laser.It is found that the upconversion mechanism of direct upconversion sensitization l uminescence of YbEr:FOV sample is mainly the energy transfer between Er3+ and Yb3+ ion but not the step-by-step absorption of single Er3+ion.This oxyfluoride vitroceramics is forming PbxCd1-x F2 fluoride micro-crystallines.And the rare earth ions tend to concentrate in the micro-crystalline,in which there is an intense cluster effect .So upconversion luminescence is very strong. On the other hand,the log-log vari ation of up-conversion luminescence intensity with laser power emerges a kind of “typical saturation phenomenon”,in which F-P curve is bended gradually result ing from population exhausting in ground state.We also find a new kind of up-con version cooperative radiation fluorescence originating from a kind of Couple Sta te of cluster consisting of two Yb3+ions in this ErYb:FOV.