OBJECTIVE：To invest igtae the rationality of drug use of pregnant women in the outpatient department of our hospital，and to promote rational drug use in the clinic. METHODS ：The prescriptions of pregnant women in Beijing Shijitan Hospital Affiliated to Capital Medical University from Jan. to Dec. in 2019 were extracted by using hospital information management system ，and then analyzed statistically in respects of drug varieties ，DDDs，safety grading ，and use of Chinese patent medicine. RESULTS ：The most frequently used drugs in obstetric outpatients were vitamins and microelements ，followed by blood system and hormone drugs. Grade B drugs with good safety were most used ，the use of ungraded drugs were reasonable ，and grade X drugs were not used. There were 6 kinds of Chinese patent medicines used for pregnant women ，of which 2 kinds were marked “usable”in the drug instructions ，4 kinds were not marked in the dug instructions ，and the Chinese patent medicines that were not marked“prohibited”and“cautious”in the drug instructions were not used. CONCLUSIONS ：The drug use of pregnant women are generally reasonable in outpatient department of our hospital. The safety of some Chinese patent medicine used during pregnancy still needs to be further confirmed.