There are three main departments for children with unclear speech: I. Otolaryngology, head and neck surgery. Second, stomatology. Third, neurology. The most important disease in otorhinolaryngology is the problem of vocal cords, and some children have congenital deafness in the ears that causes unclear speech, that is, the so-called ten deaf nine mute, the main thing is to improve hearing, vocal cord problems can be considered in the vocal cords under the laryngoscope clear diagnosis. In the case of oral diseases, the more common ones are cleft lip and palate and short tongue tie, which can lead to unclear speech, while neurology is more common because of intracranial diseases that lead to unclear speech.