The high-temperature setting process of curtains includes setting in a steam setting machine at 120 degrees Celsius for about 120 minutes, which is helpful to remove harmful substances such as formaldehyde and make the curtains meet the requirements of environmental protection. However, if the curtain fabric is dyed and printed with formaldehyde in the production process, formaldehyde may remain even after high temperature setting. At this point, the curtains may release harmful substances such as formaldehyde in a short time.