Generating ultra-high pressure steam is an important way to recover the energy of ethylene cracking furnace. The ultra-high pressure steam line going to the main on pipe rack has become one of the important lines in cracking furnace area due to its high temperature and pressure and special material. Taking the heavy oil furnace in the cracking furnace area of a newly-built ethylene plant as an example, this paper introduces the layout ideas of the ultra-high pressure steam lines going to the main on pipe rack, the pipe rack design and the precautions, and discusses the layout scheme of muffler. Through the comparison between two valve group layout schemes, it is concluded that the second scheme is more convenient for the operation, inspection and maintenance of valves on the platform and can save investment. Therefore, the second scheme is finally determined as the first choice.