1. Prepare three square origami sheets of the same size. Take out one of them and fold it in half diagonally. Continue to fold left and right along the centerline. Open it and fold the origami into a shape along the crease.

2. The other two origami sheets are also folded into the same pattern according to the same steps. Insert the two corners of one figure into the two sides of the square of another figure, and proceed in turn. Until each of the three figures is inserted into another figure, a three-dimensional triangular zongzi is ready.