Vitamin deficiency can make the sick child less tolerant to surgery and prone to various complications, so adequate amounts of vitamins need to be given before surgery. (1) Vitamin A and vitamin D deficiency can produce postoperative laryngospasm and convulsions. (2) Vitamin B1 deficiency can contribute to heart failure. (3) Vitamin C deficiency can affect wound healing. (4) Vitamin K deficiency can easily cause bleeding. Therefore, the supplementation of various vitamins is very necessary. At present, water-soluble vitamins and fat-soluble vitamins are more often used in mixed dosage, and the corresponding dosage is usually given according to the age.