First of all, you need to prepare a rectangular piece of paper, preferably A4 paper size, so that the folding effect is better. Then, fold the long side of the rectangular piece of paper in half, and pay attention to the alignment of the edges to ensure the effect of the sound cannon. Then, unfold the origami to get a reference line, which is convenient for folding the sound gun neatly. Then, align the four corners of the origami with the reference line and fold it into four small triangles, then fold the reference line in half and fold it vertically again. Then fold the corner edge of the upper layer to align with the right angle edge, then turn the origami upside down and fold the other corner to align with the right angle edge. Finally, hold a small corner with your hand and throw it down hard, and the paper inside will come out and make a crisp sound.