Absorption spectra, emission spectra of nanoized erbium implanted mesoporous silica functionalized with and without bis(perfluoromethylsulfonyl)amine as ligand were studied. Luminescence with high intensity has been obtained. The Judd-Ofelt strength parameters Ωt(t=2,4,6)were calculated as Ω2＝1.88×10-20cm2，Ω4＝5.45×10-20cm2 and Ω6＝3.11×10-20cm2, respectively. Oscillator strength, spontaneous emission probability, branching ratio and emission lifetime of each energy levels of Er3+were given. The peak intensity of emission spectra varying with the pump power was discussed. Stimulated emission cross section (σem＝10.9×10-21cm2) was calculated and compared with that of other host materials.