1. Preparation materials: purchase or prepare the required materials, including colored paper, colored rope, scissors, glue, pencil and measuring ruler.

2. Determine the arch design: draw the required arch design on colored paper with a pencil and a measuring ruler to ensure the appropriate size, and the size and shape can be adjusted as needed.

3. Decorative paste: paste the arch pattern cut by colored paper in the required position with glue, and add flowers, stars and other decorations according to personal preference.