1. Fold the square into four equal parts, and fold one of the equal parts in half along the middle line.

2. Turn the origami over, fold the top right angle and the bottom edge in half to form an isosceles right triangle crease, press the crease, and then open the crease.

3. Fold the top right corner parallel to the bottom edge to form an isosceles right triangle, forming an intersection with the crease in Figure 3, as shown in Figure A above.

4. Crease the crease line marked with number 1 in Figure 3 toward the middle line.

5. After the folding and pressing in Figure 4 is completed, the effect picture is as shown in the picture above.

6. Use a ruler to mark the vertical line of the isosceles right triangle shown on the top of the origami into three equal parts, and use these three equal dividing lines to make zigzags.

7. Open the origami in Figure 6 and return it to the shape in Figure 1. You will see that there are two square creases in the middle. We will fold the large square crease on the outside.

8. Press down the center of the square in Figure 7, and then gather the diagonals of the square toward the middle.

9. Place the origami paper on the side shown in the picture above, and pay attention to the square areas No. 2 and 3 marked by Sister Tree in the picture.

10. Fold the origami area marked No. 2 in Figure 9 in half to the left.

11. Fold the bottom edge of the right part of the origami in half parallel to the longitudinal middle line, press the crease, and then pull the origami back to the state in Figure 10.

12. Fold the bottom edge of the origami paper upwards and in parallel, paying attention to the position of the parallel folds.

13. When folding step 12, fold the right origami upward at the same time, and press down the intersection with your thumb to form a small isosceles right triangle.

14. Then flatten the right origami part upwards.

15. Then fold it in half to the right, flatten it, and fold the two right angles formed by the small heart back into a small triangle to complete.