Precise pulse plasma arc welding technology was utilized to repair the corrosion phen menon that appear on nickel alumin m bronze propeller. By adjusting the technological parameters such as welding current and gas flow rate, we researched the effects of adjustments on macro, bonding strength, deposition efficiency. And the analysis provided basis to optimize technological parameters. To research welding properties of nickel alumin m bronze and preliminary analysis the welding mechanism, micro-hardness, residual stress, corrosion resistance, micro-structure were tested and analyzed. The research results showed as fellows. Best welding property was acquired the welding current was 120A and gas flow rate was 8L/min. Welding repair coating had higher micro-hardness and better corrosion resistance than substrate, and residual stress of coating was relative lower. Through observing micro-structure and analyzing elements, cladding layer was more compact and distributed more evenly. Black compact cladding layer contains more Cr and Si elements. It proved that the diffuse distribution of SiO2 and Cr improved the micro-hardness and corrosion resistance of nickel alumin m bronze.