Children’s late speech is mostly due to the influence of language environment, hearing impairment, mental retardation and so on. 1. Language environment: the environment for children to learn language must be good, if children lack language learning environment, for example, parents speak less, and there is no other partner, naturally, they will speak later. 2. Hearing impairment: some children may have hearing impairment, unable to hear the surrounding sounds, do not have the physiological conditions to learn pronunciation, so the speech is late. 3. Mental retardation: Children with low mental development are often unable to understand other people’s language, and their ability to imitate is not strong, so their speech will be late. Children speak late, there may be other reasons, parents should take their children to the hospital in time to do relevant examinations, after a clear diagnosis for appropriate treatment.