Intravenous preparation center is the link between inpatient pharmacy and ward nurse station. Long-term doctor's orders for intravenous injection are sent to nurses in the preparation center by the inpatient pharmacy, and then sent to all wards after the preparation center is configured. Before dispensing, pharmacists should check the computer small prescription, check the compatibility, stability, incompatibility, rationality and confirmation of each component before preparing. After the pharmacist's prescription is reviewed, some hidden dangers of medication can be found as soon as possible.