According to “expert in one thing and good at many ”, multi-functional micro-plasma spraying system have been developed. It not only possesses spraying function, but also used such as welding, cutting and quenching etc. The micro-plasma spraying gun adopted unique passage and spraying nozzle structure and center axial to be sent the powder method. High frequency inverse technology of IGBT and micro-computer control engineering and varying the gentle switch technology are used in design of power, which possesses the characteristics of small volume, light weight, strong anti-jamming and high reliability etc. It is widely used in preparing coatings of metal and carbide ceramic and oxide ceramic. The bonding strength and porosity and hardness of coatings produced by micro-plasma spraying are superior to the same coatings produced by ordinary plasma spraying. It possesses vast application foreground in the fields, such as industry, national defence and aviation etc.