1, deaf children before the age of 5 is the best time to implant, because 12 months to 5 years old is the most active period of children's hearing development and the peak of language acceptance. After this stage, the ability to accept language is obviously reduced. If patients can wear hearing AIDS for 3 to 6 months before operation and have hearing rehabilitation training, it will be of great help to improve their speech ability after operation.

2, 6- 12 years old belongs to the second stage, and it takes a period of speech rehabilitation training to meet parents' expectations. Parents should have reasonable expectations for children over the age of 12 who have missed the language development period.