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With the aim of studying the high temperature fireside corrosion of the incinerator, CHS - 104 alloy samples covered with NaCl salt were tested in the aspect of high temperature corrosion in a laboratory simulated waste incinerator atmosphere (80%N2+5%O2+15%H2O) at 450 °C, 550 °C and 650 °C. Subsequently, the experimental samples were analyzed by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X - ray diffractometer (XRD). Results showed that: a thin protective oxide film formed on the surface of the alloy at 450 ℃, resulting in an excellent corrosion resistance; a continuously growing multi - layered oxide film formed on the surface of the alloy at 550 ℃, resulting in a good corrosion resistance; and Cl ions penetrated the oxide film on the surface of the alloy at 650 °C, causing an obvious corrosion damage to the surface oxide film with Ni - and Co - based oxides as the main corrosion produces, and thus leading to a poor corrosion resistance.