Iron core is a kind of folk art activity that is widely spread. Its characteristics are ingenious and thrilling design, and it is a high-level activity form. Its characteristics are ingenious and thrilling design, and it is a high-level activity form. Twelve or thirteen-year-old boys and girls are dressed as characters in a story, and are fixed on iron brackets in two or three layers. The iron brackets are not exposed, but hidden under the costumes, connected to each other, and the root of the brackets is fixed on the platform. Some characters seem to be suspended in the air, but in fact there is an iron ring connected to the bracket to stabilize the characters on the iron frame, so that they will not be in danger or feel uncomfortable. Before the founding of the People's Republic of China, the iron core was undertaken by a large business, and 16 strong men were hired in two shifts to carry the platform in turn-; after the founding of the People's Republic of China, it was undertaken by various industry systems, and the main content had a sense of the times, and the platform was fixed on the car and moved slowly.