Due to the influence of growth and development process, children and adolescents are not fully mature psychologically and speech development is not perfect, so their psychological disorders are not as typical as adults, so it is relatively difficult to make a clear diagnosis. How to detect psychological disorders in children and adolescents at an early stage? This is based on careful observation, and the following principles should be followed: a. Is there any change in the child compared to before? Many psychological disorders can be detected early by comparing the child’s current performance with his or her previous performance. For example, in the past, the child is lively and cheerful, academic performance and good relations with classmates, but recently it is quiet, performance has dropped significantly, and gradually distant from classmates, teachers and parents are not polite up …… In short, and before than, like a new person! If this happens, parents should consider whether their child has a psychological disorder. 2. Is there a significant difference between your child and other children? It is possible that the child’s performance does not change much compared to before, but compared to other children (especially children of the same age), there is a significant difference. For example, other children of the same age can talk and count, but he/she cannot; most children in kindergarten like to play with everyone and are very “social”, but he/she does not want to play with other children, but just plays alone, immersed in his/her own world; some children even claim that they can hear sounds that others cannot hear and see things that people cannot see. Seeing things that the average person cannot see …… When a child behaves differently from most children, parents should also consider whether the child has a psychological disorder. Is the child’s behavior socially and culturally acceptable or understood by most people? Some children may behave in a way that does not conform to the norms of society, and we should also consider whether the child has a psychological disorder. For example, if a child does not follow the school rules at school, contradicts parents and teachers, often fights with classmates, steals, or even robs, runs away from home, or lies frequently …… these behaviors are not allowed by social norms, and if the child shows these behaviors, we should also consider whether there is a possibility of a psychological disorder. In conclusion, parents must carefully observe whether their child has a psychological disorder, and discover early on whether the child may have a psychological disorder by comparing the child with himself, with his peers and whether the behavior is socially acceptable.