The nasolabial fold is a very special area, which is the stopping point of several facial expression muscles. The pulling force of facial expression movement creates a great pressure at the nasolabial fold. This structural feature determines that when injecting fillers into the nasolabial fold, no matter what substance is injected, the injected material can easily be injected into the outer part of the nasolabial fold, making the outer part more convex and deepening the nasolabial fold, or even if the injected material is injected into the lower part of the nasolabial fold, making the nasolabial fold shallower at that time, but with the facial expression The reason for this is that besides partial absorption, the rest of the injected material is squeezed to the outside of the nasolabial folds and the folds return to their original depth or even deeper than before. Considering the above characteristics, we will introduce an example of filling nasolabial folds with autologous fat transplantation. The correct way to fill the nasolabial folds should be to use a small needle knife to subconsciously separate the deep side of the nasolabial folds and form a cavity of appropriate depth and width on the side of the corner of the mouth, and fill the nasolabial folds with autologous fat injection, but the amount should not be too large, otherwise it will be squeezed to the outer area of the nasolabial folds with the movement of expression, thus deepening the nasolabial folds. Only the right amount of fat can be filled in such a way that the autologous fat will not be displaced after transplantation, and the survival rate is higher after the right amount of fat is transplanted. Although some of the fat will be absorbed, the final result will be obvious and long-lasting. From this point of view, all the artificial products (such as Rilan and other hyaluronic acid products) can only be injected into the nasolabial folds with a fine needle, and cannot be injected after the separation of the nasolabial folds (the products are gel-like, if the nasolabial folds are separated from the skin and then injected, all the injected material will be lost through the separation hole because of the large needle hole), so they will not have good results. In other words, all artificial products currently on the market are not suitable for filling the nasolabial folds. Autologous fat, on the other hand, is the best material for filling nasolabial folds because it is in the form of small particles, does not flow out after injection and will grow and fuse with its own tissues, and has long-term effects. Of course, the depth and amount of autologous fat filling must be mastered in order to have good results. Otherwise, it will be counterproductive if the fat is not accurately injected or if it is displaced to the outside after being injected too much.