It has long been thought that for children, food and clothing are the first priority, and that other aspects will naturally get better when they grow up, but this is not true. In my specialist clinic, I often encounter many parents accompanying their children to consult about children’s emotional problems, and children’s emotional disorders are a serious reality in front of us. Emotion is a psychological experience that arises when a person’s wishes and physiological needs are met or not. Conformity to human needs and desires will cause positive, affirmative emotions, and the opposite will cause negative, negative emotions. If the negative emotions are not well regulated, then emotional problems can occur. Due to the lack of expression skills and the lack of a suitable person to talk to, children’s emotional problems become more and more serious and eventually develop to the point where they do not adapt to the real life environment. Since the 1980s, play therapy has become increasingly important as single-parent families, divorce, school and community violence, media violence, child abuse and substance abuse have become more serious and have an increasing negative impact on children. Developmental psychologists believe that it is necessary for children to “vent” their negative emotions and feelings in appropriate ways, such as through play. The systematic use of play as a medium gives children the opportunity to express their inner world naturally while building a process of interpersonal interaction. In this process, therapists trained in play therapy apply the therapeutic utility of play to help children, prevent or resolve psychological dilemmas in order to achieve positive growth. Reasons why play can be a primary form of psychotherapy for children, both individually and collectively: 1. It allows children to vent their emotional feelings and frustrations, and the play experience can renew children’s lives and benefit their health; 4. How do children vent their emotions in play therapy? Children in play therapy must be guided by the therapist, who occupies an irreplaceable position. The therapist purposefully chooses the type and method of play, so that the child learns to vent his or her emotions in play therapy. Play therapy requires an interactive relationship between the child and the therapist; while most children go to the playroom without hesitation, if the child is reluctant, her mother may be invited to walk with them to the playroom, and when the therapist judges that the time is right, the child separates from her mother at the door and quickly enters the playroom. In the playroom, the child is the guide and has the right to make changes in his choices. He can play or not play, he can choose any play materials and how to play, and he can even choose to sit in silence. Forcing the child to talk or ignoring his feelings during play reduces the degree of freedom. The therapist should not rush the child in any of his behaviors, even when he is reluctant to talk or play, but can say something about the child that makes him feel safe and comfortable in the playroom and with the therapist. Thus, it can be seen that in play, the child gives vent to his feelings and emotions, just as the adult speaks out his feelings and fears through conversation. Play is the language of the child and healthy play plays a role in promoting healthy development. If you have such a child around you, be sure to be patient and provide opportunities for play therapy so that they can learn to heal themselves without harm, because they were not born that way, they have suffered great harm inside. Psychoanalyst Sigmund Freud once suggested that the experience of early childhood is very important and will affect a person’s whole life, so let’s all pay attention to the mental health of our children.