Stairs can be divided into two floors, three floors, four floors, and other types, and the flight of each floor area is connected to the top and bottom frame purlins of the current floor. So, each layer can be pre assembled and directly lifted and connected layer by layer, which is convenient and fast; The inner staircase segment is made of 3mm thick steel plate, covered with high-quality floor leather and anti slip strips, and equipped with stainless steel handrails, creating an atmosric and upscale effect; The staircase adopts sound and light controlled energy-saving lights for lighting, which is convenient to use.