Delayed language development is a condition in which a child’s verbal or language comprehension skills are significantly behind the normal developmental level of children of the same age for various reasons. It can affect a child’s learning and daily life. There are many different causes of speech delay, and the common causes are that children with mental retardation have varying degrees of language development. If the child’s hearing is impaired, it can also affect language development, resulting in delayed language development; if the child has some central nervous system disease that causes brain damage, it can also affect delayed language development; if the child has abnormalities in the vocal cords and other phonological structures, it can also affect the child’s language development; finally, if the language environment is poor, the adults in the family have delayed language development or live in a soundless Finally, if the language environment is poor, the adults in the family have delayed language development or live in an unaccented home environment, it will also affect the child’s delayed language development. As mentioned above, speech delay is not a simple disease, but a common manifestation of many diseases. Therefore, while actively treating speech delay, it is important to actively treat the primary disease in order to have a better treatment effect.