The symptoms of Angel Syndrome are complex and include the following: 1) tics, which are present in most children and are often indistinguishable from tremors and choreographic movements of the limbs; 2) abnormalities in pacing and movement, which are often excessive, occurring in the trunk and limbs, and the child usually learns to walk late, starting to walk only after 3-4 years of age; 3) hyperkinesis, also known as hypermobility, which is associated with attention deficits; 4) happy and excessive laughter, the mechanism of which is not yet clear. It is related to attention deficit; 4, happy and excessive smile, the mechanism is not yet clear, the child starts to show smiling behavior after 3 months, at first giggling, and then turning into non-stop smile, and finally there will be delayed symptoms; 5, language ability, the language ability is relatively poor, and often unable to communicate; 6, intellectual disability, the development of the mind and the attention deficit, language ability and so on are related to the development of the mind, and there is often a slower mental development and intellectual deficits.