Objective To summarize and analyze their rational prescriptions in pharmacy intravenous admixture services(PIVAS)of our hospital from January 2017 to December 2019,so as to improve the level of rational drug use. Methods The data of irrational prescriptions from January 2017 to December 2019 in the pharmacy intravenous admixture services of Guangzhou First People's Hospital were collected for retrospective analysis, and the types of irrational prescriptions were summarized, the performance of irrational prescriptions was analyzed and the irrational situation was corrected. Results The main types of irrational prescriptions include incorrect selection of solvent, improper consumption of solvent, improper drug dosage, incompatibility and others(improper frequency of administration, incorrect selection of drug, repeated administration, etc.). Conclusion According to the summary and analysis of irrational prescriptions, we timely communicate with clinical departments and ensure rational drug use.