There are two main reasons why a child’s eye axis grows too fast: first, the child’s eye habits are not correct, such as excessive use of computers, cell phones and other electronic products; reading for too long, such as these cases will lead to the rapid growth of myopia, thus making the eye axis grow too fast. For this situation, it is recommended to maintain reasonable eye habits and increase outdoor time appropriately, which is the only way to control the speed of myopia development. Second, mainly due to genetic factors, such as the child’s parents have high myopia, then the child’s myopia growth is faster, and the possibility of high myopia is also very high. Under normal circumstances, if the growth rate of the eye axis is too fast, posterior scleral reinforcement can be considered to slow down the growth rate of the eye axis.