If a child is three years old and still does not speak, it may be due to dysarthria, hearing impairment, autism and other reasons. 1. Dysarthria: It is due to organic lesions in the neuromuscular organs of the patient’s organs of articulation, resulting in the weakness of the muscles of the organs of articulation, leading to abnormal muscle tone and causing dysarthria, which will lead to the inability to speak. 2. Hearing impairment: Hearing impairment is caused by bacterial or viral infection during pregnancy or after the birth of a child, head trauma, radiation and other factors, and there may be genetic factors leading to sensorineural deafness. 3. Autism: Most autistic people are accompanied by communication disorders, due to impaired speech comprehension, there will be no speech. Children three years old still do not speak, it is recommended that parents take the child to the regular hospital in time for a professional examination to identify the cause of the disease and then targeted treatment.