The folding method of the paper sword is as follows:

1. Prepare a rectangular piece of paper with a length-to-width ratio of 2:1, then fold the long end in half along the center line and open it.

2. Fold the top and bottom to the center line respectively.

3. Fold the upper and lower sides of the right side toward the center line.

4. Fold the top and bottom to the center line again and open them.

5. Turn over the origami and fold the left side to the right.

6. Turn over the origami again and fold the upper and lower sides of the left side to the quarter crease.

7. Open the previous step and use the small triangle crease to fold inward and downward.

8. Then fold the top of the origami to the right.

9. Turn over the origami, cut the red line with scissors, and then fold the upper and lower sides of the right side of the cut toward the center line.

10. Fold the right side to the left and then back to the right.

11. Fold the origami paper in the middle to make a small triangle.

12. Open the small triangle folded in the previous step, and use the crease to fold downward and inward toward the center line.

13. Turn over the origami paper and the sword will be folded.

Origami is a highly malleable handmade art. The art of origami not only has aesthetic value, but also contains mathematical operations and spatial geometry principles. Through observation and thinking, children can create different shapes and folding methods during the origami game, which subtly stimulates children's creativity and continuously develops their intelligence. Children's curiosity and creativity sometimes exceed the imagination of adults.