A method for repairing a heat resistant superalloy member (14, 20), by forming an aluminide coating on a surface of the heat resistant superalloy substrate, comprising the steps of: exposing a base metal of the heat resistant alloy substrate in a selective area (26, 34) where the aluminide coating is to be formed; wherein an area except for the selective area of the heat resistant superalloy substrate (26, 34) has a ceramic thermal barrier coating layer formed thereon, forming a film of metallic aluminum or an aluminum based alloy film on the exposed base metal, by a non-aqueous electroplating; and conducting a heat treatment to the heat resistant alloy substrate on which the film is formed, in order to make a diffusion reaction between an aluminum component in the film and the base metal, thereby forming the aluminide coating, wherein there is used, as a plating liquid, a non-aqueous plating liquid containing a halide of the metal to be plated (a metal halide), where the metal halide comprises an aluminum halide and optionally also halides of metals other than aluminum which have a negative standard electrode potential, and an organic compound which forms an ion pair with the metal halide, wherein the non-aqueous electroplating is carried out by immersing topically the selective area into the non-aqueous plating liquid, characterized in that the top surface of the non-aqueous plating liquid is liquid-encapsulated with a hydrophobic liquid consisting of a silicone oil, the hydrophobic liquid being a liquid which phase-separates from the non-aqueous plating liquid and has a smaller specific gravity than the non-aqueous plating liquid, for shielding the non-aqueous plating liquid from the atmosphere. exposing a base metal of the heat resistant alloy substrate in a selective area (26, 34) where the aluminide coating is to be formed; wherein an area except for the selective area of the heat resistant superalloy substrate (26, 34) has a ceramic thermal barrier coating layer formed thereon, forming a film of metallic aluminum or an aluminum based alloy film on the exposed base metal, by a non-aqueous electroplating; and conducting a heat treatment to the heat resistant alloy substrate on which the film is formed, in order to make a diffusion reaction between an aluminum component in the film and the base metal, thereby forming the aluminide coating, wherein there is used, as a plating liquid, a non-aqueous plating liquid containing a halide of the metal to be plated (a metal halide), where the metal halide comprises an aluminum halide and optionally also halides of metals other than aluminum which have a negative standard electrode potential, and an organic compound which forms an ion pair with the metal halide, wherein the non-aqueous electroplating is carried out by immersing topically the selective area into the non-aqueous plating liquid, characterized in that the top surface of the non-aqueous plating liquid is liquid-encapsulated with a hydrophobic liquid consisting of a silicone oil, the hydrophobic liquid being a liquid which phase-separates from the non-aqueous plating liquid and has a smaller specific gravity than the non-aqueous plating liquid, for shielding the non-aqueous plating liquid from the atmosphere.