High A-function may affect the development of fetal nerve center and intellectual development, affect fetal growth and development, and cause difficult labor. 1. Affecting the development of fetal nerve center and intellectual development: at the important stage of fetal nervous system development, the presence of high AF may affect the development of fetal nerve center, and may even lead to mental retardation of the fetus after birth. 2. Affecting the growth and development of the fetus: patients with high A-function, the basal metabolic rate will increase, which will easily cause tissue hypoxia, hypoxia will affect the normal growth and development of the fetus. 3. Difficulty in labor: If the patient has a high A-function during pregnancy, the uterine contraction is likely to be weak in the process of delivery, which will easily cause difficult labor. It is recommended that patients with high thyroid function should consult a doctor in time and take standardized treatment under the doctor’s guidance, and do not take medication without authorization, so as not to aggravate the condition.