The present invention provides a process analysis method based on ethylene cracking furnace operation data. Compared with the traditional DCS analysis, the method has the advantages of real-time diagnosis, accurate diagnosis, strong adaptability of furnace type and so on. The method helps the field engineers and operators to discover and solve problems from the source, improves the safety of the ethylene operation process, realizes the intelligent monitoring of the ethylene cracking furnace operation process, and has the innovation in the traditional ethylene industry.