Combined with the overall plan of cracking furnace, the original design of cracking furnace and the actual situations on site, this article introduces how to implement the standardized transformation of radiation coil, radiation section lining, radiation section steel structure, convection coil, convection section steel structure and convection section lining of two SL-Ⅱethylene cracking furnaces, explains the application scope and implementation of different standardized transformation schemes, and discusses the scientific nature, rationality and feasibility of the transformation schemes.