Abstract: This paper introduces the basic situation of using Tekla Structures software for whole furnace design modeling of cracking furnace and its application to digital factory. Using Tekla Structures software for the whole furnace modeling design of cracking furnace changes the traditional design method and improves the design quality and efficiency greatly. Combining with the application in digital factory, the model transfer between upstream and downstream departments can be carried out; the design interface can be reduced clearly and intuitively and the design efficiency among different disciplines can be improved, which is of great significance for the application of digital factories in the design of cracking furnaces.