1. Divide the paper horizontally and vertically into eight equal parts, fold it in half along one diagonal line, then fold it in half along the marking line, and then fold it in half on the other diagonal line after unfolding. The folding method is the same.

2. Take a corner and fold diagonally (the length and width are two small square units), as shown in the figure; The other three methods are the same.

3. Fold back along the center line of an opposite side, then fold it in half again along the center line, then open the two corners to the left and right respectively, find the small square marked at the top, and fold it diagonally downwards.

4. Unfold the paper (the four corners are not unfolded), deepen the crease of the small square in the middle, then press down a diagonal line of the small square with a folded corner, then fold up the sides of the four corners of the square in turn, and open the paper from below, with a small square in the middle.

5. Find the triangle where one side of the small square in the middle is located, and find two creases (three small square units on the left and two small square units on the right) corresponding to the vertices of the triangle, and then take these two creases as the boundary to press down some of them; The other three sides are folded in the same way.

6. Turn to the back. Take a corner as an example, find the first small square (two small square units) on the side with the shortest corner, fold it in half along the diagonal, then unfold it, fold it inward along the crease, and finally turn the right corner to the right along the crease and turn the left corner to the left along the diagonal of the big square (two units); The other three methods are the same.

7. Press the longer part on the shorter part, and then fold the tip part down into a triangle; The other three angles are the same.