An important sign of children's mental health includes moderate emotional response, that is, children can respond appropriately to happy or unhappy things without expressing emotions excessively or insufficiently. Self-experience pleasure means that children have positive feelings about their own state and can experience happiness and satisfaction. Good social adaptation means that children can adapt to the environment, have good interaction with people around them and establish positive interpersonal relationships. Psychological development reaches the normal level of children of the corresponding age group, which means that children's cognition, movement, language, self-awareness and personality can develop normally according to the development law of their age group. These signs are important indicators of children's mental health and are very important for their all-round development and healthy growth.