Studies have shown that there are more genes related to appearance than those in other parts of the human body. Very many genes are involved in the construction of the ever-changing appearance features of facial structure, hair, eyes, and skin color. Therefore, the human face has a clear genetic characteristic. However, genetic diversity is also limited, there are only so many people. At some point, people will have the same deck of cards in your hand. This text is intended to explain. ['The richness of facial features comes from the diversity of genes.', 'Human face collision is due to limited diversity of facial genes.', 'Genetic characteristics of the face are more pronounced within family members.', 'The ability to distinguish between individual appearances can benefit humans.']