Children in nervousness, depression, frustration, low self-esteem and other emotional states may cause nail chewing behavior, is a sign of insecurity. Parents can improve their children’s nail-chewing behavior by following several methods: 1, do not overly scold the child, if forced to stop the child may cause negative reinforcement. 2, usually try to spend more time with the child, more interaction with the child, play games, encourage the child to make more friends, so that the child feels the love of parents and develop the child’s self-confidence. 3, do not let the child’s hands idle, enrich the child’s extracurricular life. Develop hobbies related to hands, such as handicrafts, painting, chess, etc. Remind parents that parents must be patient, no matter which method, it is not overnight can be effective.