The upconversion fluorescence emission of Er3+ -doped 60GeO2-20PbO-20PbF2 glass was experimentally investigated under the pump of 976-nm laser diode. The results reveal the existence of intense emission bands centred around 524, 545, and 657nm at room temperature. The green emission at 524 and 545nm is due to the 4S3/2+2H11/2→4I15/2 transition and the red emission of 657 nm originates from the 4F9/2 → 4 I15/2 transition of Er3+. The quadratic dependence of the green and red emissions on excitation power indicates that a two-photon absorption process occurs under the 976-nm excitation. The excited- state absorption from 4I11/2 and the cross relaxation between two Er3+ ions in the 4I11/2 state contribute to the green emission. The red emission at 657nm is attributed to the excited-state absorption and cross relaxation processes in the 4I13/2 level as well as the 4S3/2level nonradiative transition of Er3+.