The principles of using anesthesia drugs are as follows: 1. Use small doses, because in terms of intravenous sedative and analgesic drugs, individual differences are relatively large, so it is strictly prohibited to use the maximum recommended dose into the patient’s body at one time to avoid danger, and the dosage of drugs suitable for the patient should be found in the form of an add-on; 2. The principles of using drugs are different for different age stages. For example, when using the inhalation anesthetic sevoflurane, we must understand the MAC value of different age stages, such as newborns, over 3 years old or over 40 years old, according to the patient’s physical condition, if the patient’s body is poor, the MAC value is reduced, and the dosage of the medication should be reduced discretionarily, and for some young and strong or suffering from hyperthyroidism and other endocrine diseases, the metabolism is relatively fast, it may be have to increase the drug dose appropriately.