1 Valley fold a sheet half-and-half on a vertical. Unfold it.

2 Valley fold the lateral sides to the centre line.

3 Turn a sheet on other side.

Valley fold each rectangular on the diagonals as shown.

4 Step fold the paper to make the creases being guided on the existing fold-lines.

5 Valley fold the model in half.

6 Valley fold the wings, generate a trunk of the butterfly.

7 Butterfly is ready!