Taking the reconstruction of a 1100 kt/a ethylene plant as an example, the project background of the early removal of low-pressure methane compressor is introduced, the changes in operation parameters of ethylene plant after compressor shutdown is analyzed, and the influence of hydrogen purity reduction on ethylene plant and downstream units is evaluated. The conclusion is that the early shutdown of the low-pressure methane compressor will not lead to load reduction of the ethylene plant or cause the discharge of methane tail gas to the flare. The feasibility demonstration of the scheme provides a reliable technical basis for the owner to formulate the shutdown and reconstruction scheme. At the same time, it provides reference for ethylene plants with low-pressure methane compressor to deal with special conditions such as the unplanned shutdown of compressor unit.