To solve the problems such as increased energy consumption, shortened operating cycle and pipeline blockage caused by the corrosion leakage of dilution steam system in ethylene plant, this paper identifies the root causes of the corrosion of quench water and dilution steam systems through technical research and experience summary, and establishes anti-corrosion technological processes and monitoring analysis standards to guide the unit in strengthening equipment operation management, improving corrosion monitoring and detection effectiveness, optimizing process anti-corrosion measures and eliminating corrosion hazards, so as to ensure the long-term operation of critical equipment in the quench water and dilution steam systems.