In this paper, FexCr5Al (x=13, 15, 17, 18, wt%) alloys were prepared and exposed to 1000 and 1200 ℃ steam for 2 h. The high temperature oxidation behaviors of the alloys were studied by a simultaneous thermal analyzer. The microstructure and composition of the oxide film after oxidation were analyzed using XRD, FIB, EDS, and TEM. It was found that the oxidation kinetics of the alloys at two temperatures followed a parabolic growth law. The parabolic rate constants of the alloys were decreased with an increase in Cr content, and the high temperature steam oxidation resistance of the alloys were improved. The ridged oxide films mainly composed of a-Al2O3 were observed in the four alloys. In comparison with the low Cr alloy, the pores of the oxide film were reduced, and the bonding force of the oxide/matrix interface was improved in the high Cr alloy. Consequently, the compactness and adhesion of the oxide film were improved by increasing the Cr content, which promote the formation of a dense Al oxide film and enhance the high temperature steam oxidation resistance of the alloy.