Based on modern people's aesthetic point of view, proportional symmetry and overall harmony are necessary conditions for human health and beauty. For example, the bridge of the nose collapses and the lips are too thick, which are all caused by uneven proportions. Another example is the round face and small eyes, which make the whole look very uncoordinated. By means of plastic surgery, the aesthetic standards that the human body itself has not reached can be achieved. When a person reaches his own aesthetic standards, his mentality will become more confident, and a positive attitude towards life will follow.