Unclear speech in three-year-old children is usually caused by environmental factors, developmental delays, hearing impairment or abnormal oral structures. It is necessary to seek medical diagnosis in time to determine the cause and deal with it accordingly. Common causes and treatment methods 1, environmental problems: If parents usually have less communication with their children, it will lead to unclear pronunciation when the child speaks. Parents should communicate more with their children in life to develop their ability to speak; 2. Developmental delay: Children with abnormal neurological development and backward intelligence, accompanied by delayed language development and unclear speech, cannot express themselves fluently. If it is accompanied by other symptoms such as slow reaction, it is necessary to go to the hospital to diagnose whether there is abnormal development of the nervous system, diagnose in time, treat for the cause, and intervene early; 3. Hearing impairment: children who suffer from ear disease or hearing impairment are also prone to be unable to pronounce their own words accurately because they cannot hear others’ speech pronunciation clearly. Parents need to take their children to the ear, nose and throat department as soon as possible, and can apply cochlear implants to help restore hearing; 4, oral structure abnormalities: if some children do not speak clearly because the tongue tie is too short, etc., they need to seek medical advice in time, and if necessary, surgical treatment can be performed. Note parents need to communicate with their children more in life, exercise the child’s expression ability, you can properly let the child watch movies, cartoons, etc., to enhance the child’s sense of language. You can participate in speech correction therapy in the Department of Dentistry, and you can add more protein and vitamins to the diet to promote the child’s intellectual development.