The strength, corrosion resistance, hardness, resistance and thermoelectric properties of pure copper and nickel can be significantly improved, and the temperature coefficient of resistivity can be reduced. Copper-nickel flat tube is a thin-walled porous flat tube material, which is mainly used in air-conditioning systems of various refrigerants. As a pipe component carrying new environmental protection refrigerants, the new environmental protection system is the key material of a new generation of parallel flow microchannel air-conditioning heat exchangers.