First, bring the cardboard we prepared. Ordinary cardboard will do, because this cardboard will be the cover of the last Christmas card, so it's better to be strong. Fold the long side of the cardboard in half, that is, fold it as shown in the figure. So the main shell of a simple Christmas card is completed.
Then draw green paper with the help of a ruler, and pay attention to the width of the lines. The first one is 3.5 cm, the second one is 5 cm, the third one is 6 cm and the fourth one is 6.5 cm. There is actually no strict definition. You can determine the width according to your preference.
But don't let him look strange on the Christmas card. There is basically a gradient change. After all, the Christmas tree is the protagonist of the whole card.
After the previous drawing is completed. We folded the paper in half along the long side, similar to the real folding when we just made the Christmas card shell, and now we do the same folding.
On the basis of the previous folding, fold it in half in the same direction. After folding, flatten the origami model. At this time, we get a small folded rectangular structure as shown in the figure. When the folding in the above steps is completed, we need to fold the origami model in the same direction again.
After this folding, the paper became very thick, but now is not the time to stop, because we need to fold the paper again.