Mo–Si and Mo–Si–Al alloy coatings were synthesized on the surface of nickel-based superalloy substrate using electro-thermal explosion ultrahigh speed spraying technology. The coatings have dense microstructure with submicrometer size grains. The microhardness of the coatings is in the range of 1100–1350HV. The weight loss of Mo–Si alloy coatings is found to be 2mg/cm 2 on exposure at 500°C for 840h and 20mg/cm 2 on holding at 900°C for 360h, respectively. However, Al alloyed in Mo–Si coatings obviously slows down the oxidation at high temperature. The weight loss of Mo–Si–Al alloy coatings is only 0.5mg/cm 2 at 500°C for 840h and 7mg/cm 2 at 900°C for 360h, respectively. The weight loss ratio of Mo–Si–Al alloy coatings decreases about 70% comparing to that of Mo–Si alloy coatings. The pest disintegration of the MoSi 2 can be suppressed by electro-thermal explosion ultrahigh speed spraying technology and alloying Al.