1. Square paper is folded diagonally into a right triangle, and then folded left and right to spread the paper.

2. Fold the right angle of the upper paper downward until it coincides with the midpoint of the bottom edge to form a small triangle.

3. Fold in half at right angles until it coincides with the midpoint of the bottom of the small triangle, and then unfold it to form a dotted line as shown in the figure.

4. Fold the lower right corner inward until the red line partially overlaps, and fold the lower left corner in the same way.

5. Fold the right side inward along the dotted line.

6. Turn the paper over and fold the other side in the same way.

7. Draw the petal shape and cut it open.

8. Opening the paper is the simplest plum blossom.

9. Now fold the paper again along the fold line, then draw the shape of the stamen near the sharp corner (the black shadow in the figure), then cut off the black shadow with scissors, and spread the center of the plum blossom to have the shape of the stamen.

10. If you cut off the shadow of this shape, you will get a beautiful hollow plum blossom.