Tungsten-lanthanum alloy is formed by adding lanthanum oxide (La2O3) with the weight percent of 1% to 2% into tungsten to improve its creep resistance and recrystallization temperature. With fine distribution of oxide particles in its structure, our tungsten-lanthanum alloy is also easy to machine. The electronic work function of tungsten-lanthanum oxides is obviously lower than that of pure tungsten.