The golden rule was discovered by the ancient Greek mathematician Pythagoras, and the name became popular in the 19th century when the ancient Greek aesthetician Plato called it the “golden mean”. The so-called “golden section” is a mathematical proportional relationship in line with aesthetic standards, if the use of the golden section will be a line in two, should meet the “whole and the ratio of the larger part” just equal to “the larger part and the smaller part of the ratio”, and the “golden section”. ratio of the larger part to the smaller part”, that is, the product of the full length and the short section is equal to the square of the long section. After the mathematical calculation of the quadratic equation, the exact value is Φ=(√5-1)/2, whose solution is an irrational number that does not loop, and the approximate value is 0.618. Many proportions of the human body are close to the golden ratio, such as the navel is exactly the golden point of division from the top of the head to the bottom of the foot, and there are also many places in the face that conform to the golden ratio, such as the ratio of the width of the head to the length of the head, the ratio of the width of the face to the length of the face, and the ratio of the width of the nose to the length of the nose. For example, the ratio of head width to head length, the ratio of face width to face length, the ratio of nose width to nose length, the ratio of lip height to lip width, the ratio of nose width to mouth angle spacing width, the ratio of mouth cleft length to the spacing between the outer canthus of the two eyes, and the ratio of upper and lower lip red height, all of which are approximately equal to 0.618.