Abstract: Higher requirements for oxidation resistance and structural stability of key components in high temperature environment were put forward. The process parameters control, microstructure characteristics, mechanical properties and high temperature behavior of CoNiCrAlY coatings prepared by laser cladding, supersonic flame spraying and plasma spraying were compared and analyzed, and the evolution mechanism of different processes in coating compactness, interface bonding and thermal oxidation reaction was clarified. The results show that the laser cladding coating has significant advantages in microstructure stability and comprehensive performance, which provides technical support for the design and optimization of thermal barrier coatings under high temperature service conditions.