A new Ni-BaCe0.4Zr0.4Nd0.2O3-δ （Ni-BZCN4）cermet membrane was used to separate hydrogen from mixed gas containing hydrogen. Hydrogen permeation properties of the membrane were investigated under various conditions. Hydrogen permeation flux increases with temperature. When the feed gas was moistened by 3% H2O, the flux is about twice of that not moistened. And it reaches 0.29 cm3/ min.cm2 at 900 °C when a wet 80% H2/He feed gas was used. The permeation stability of Ni-BaCe0.4Zr0.4Nd0.2O3-δ membrane was investigated under atmospheres containing 30% CO2 and H2O. After 100 h operation, the membrane still keeps a steady permeation flux. These results suggest that the Ni-BZCN4 membrane is suitable for hydrogen separation from mixed gas containing H2 and CO2.