The visible transmission and refractive index varying with wavelength of TeO2-NbO2.5-PbO glasses were measured by changing composition in (90-x)TeO2-xNbO2.5-10PbO(x=10&30) glasses. The results show that the UV cut-off moved to longer wavelength with x from 10 to 30. When x is 20 the refractive index and nonlinear susceptibility tends to highest level.