Gradient （Ti,Al）N film was deposited on 1Crl 1Ni2W2MoV stainless steel for aero-engine compressor blades by arc ion plating. The microstructure of the film and the high temperature oxidation behavior of the coated steel were studied results showed that the gradient film had a B1 （NaCl） structure with （220） preferred orientation, and with inner layer rich in TiN and outer layer rich in （Ti ,Al）N. The film was very dense and adhensiwe.The oxidation results indicated that the gradient films were protective at 700 ℃ for long time and at 800 ℃ for short time. It was found that protective layers rich in amorphous alumina formed on top of the gradient （Ti,Al）N film during the elevated temperature oxidation which protected the film from further oxidation
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