In this paper, the main process parameters affecting the cracking yield and their interrelationships are briefly described. Five chemical raw materials, including ethane, propane, butane, LPG and naphtha, are selected respectively as the cracking feed to ethylene cracking furnace. The ethylene yield with different furnace tube configurations are mainly explored, and the influence of different tube configurations, coil outlet temperatures (COT) and coil outlet pressures (COP) of cracking furnace are analyzed. The relationship between ethylene yield and the conversion rate of key components, the ratio of propylene to ethylene and other indicators characterizing the cracking depth are analyzed, providing reference for the selection of radiant tube and the optimization of cracking furnace operation conditions.