Step 1: Fold a Zhang Kuan 16cm long and 16cm wide square colored paper from bottom to top, take it away, rotate it and fold the other side line.

Step 2: After the two pairs of lines are folded in half, open the four corners and aim at the center point to fold again.

Step 3: After folding in half, fold in half from bottom to top to two thirds, and fold in half on both sides to three equal parts.

Step four, fold it into three equal parts, then open it and stand up. Similarly, fold up from the bottom to two-thirds of the top, and then fold down.

Step 5: After folding horizontally and vertically, open them all, and at the same time open the left and right triangles to fold the boxes on both sides.

Step 6: Fold the box frames on both sides, erect them, pick up the two ends of the second crease from top to bottom, squeeze them into the middle, fold them naturally, and then pick up the triangle and fold it down to the bottom of the box.

Step 7, after folding, turn it around, turn the bottom to the top, fold it naturally in the same way, and then leave the box cover.