In fact, there are quite a lot of autistic patients nowadays, but autism is currently recognized as the biggest problem at home and abroad, and its cause is still unclear. Many scientists are now studying it and it may be related to the following factors. Genetic aspects, the role of genetic factors in autism has been very obvious, but the specific way of inheritance may not be very clear. It has been reported that there are more than 400 related genetic mutations to corroborate the genetic mutations in autistic children; perinatal factors, like various perinatal complications, such as birth injuries, intrauterine asphyxia and other high-risk factors, may also contribute to the incidence of autistic children; some experts and also some researchers have also found abnormalities in the immune system of these autistic children, finding a reduced number of T-lymphocytes, and Some experts and researchers have also found abnormalities in the immune system of autistic children, including a decrease in the number of T lymphocytes, a decrease in the number of some helper T cells and B cells, a lack of suppressor and inducer T cells, and a decrease in the activity of natural killer cells. -Adrenal axis abnormalities, which may lead to increased 5-hydroxytryptamine and endorphins and decreased secretion of adrenocorticotropic hormones. Whatever the cause of autism, the cause is not too clear at the moment, so we may need further relevant scientific research in the future to corroborate the relevant evidence.