Abstract: A hybrid Er3+-doped/Er3+/Yb3+ co-doped double-cladding fiber amplifier is developed. It comprises an Er3+-doped fiber amplifier as a pre-amplifier and a Er3+/Yb3+ co-doped double-cladding fiber amplifier as a post-amplifier. In the Er3+-doped fiber amplifier, the active fiber is a 20m Er3+-doped fiber and is pumped by a single mode semiconductor laser diode with maximum output power of 318mW. The maximum output powr of the pre-amplifier is 113mW. In the Er3+/Yb3+ co-doped double-cladding fiber amplifier, the active fiber is 14m Er3+/Yb3+ co-doped double-cladding fiber and is pumped by two multimode semiconductor laser diode at the wavelength of 915nm. When the input signal power is 10mW and the signal wavelength is 1555nm, the maximum output power of the hybrid fiber amplifier is 32.04dBm or 1.6W, corresponding light-light transfer efficiency is 18.5%.