1. First cut the cardboard into a strip of paper about 4cm wide.

2. Then fold the corners and align them.

3. Then turn the long side inward and align with the previous triangle.

4. Fold the two folded triangles in half and press out the mark.

5. Then fold the long side bit by bit according to the above method.

6. Fold into a triangle.

7. Then unfold the folded triangle, and according to the folded imprint, fold the imprint in one direction and fold it into the following shape.

8. Roll a triangle layer by layer from one end and stick it with glue at the end.

9. In the same way, fold colorful zongzi with cardboard of different colors.

The above is the way to wrap zongzi with a long piece of paper.