1, speech delay caused by hearing impairment should be based on the time and degree of hearing impairment recovery. Generally, hearing impairment recovers earlier, and the recovery degree is better in the critical period of language development. Language barriers can be cured; If it is moderate or severe hearing impairment, the recovery time is late, the critical period of language development is missed, the recovery degree of hearing impairment is poor, and the possibility of restoring normal language is very small;
2. Language development retardation caused by the separation of language environment. If the language environment returns in time, supplemented by corresponding speech training, language delay can be cured. However, if the corresponding language environment does not appear in time, it may cause children to leave language barriers for life.