OBJECTIVE： To provide reference for clinical rational drug use. METHODS： Medication error （ME） cases reported from outpatient department from Oct. 2014 to Sept. 2015 in our hospital were analyzed， including ME category， classification， cause and proportion of persons who triggered or detected ME. RESULTS： Among 207 reports， there was no case of category A， 199 cases of category B， 8 cases of category C， no of categories D-I. Among them， 162 cases occurred in the links of prescriptions by doctors （78.26％）， 45 cases （21.74％） occurred in the links of dispensing prescriptions by pharmacists， the top 3 ME were improper usage （42.59％）， improper administration route （40.74％） and inappropriate solvent （5.56％）； the top 3 dispensing errors were variety error （40.00％）， specification error （28.89％） and number errors （24.44％）. The main causes for prescription errors were incomplete information system （56.17％） and drug information missing of doctors （43.83％）； the main causes for dispensing errors were double specifications of drugs （35.56％）， similar drug name （28.89％） and staffsntired （26.67％）. In terms of the persons who triggered ME， the proportions of pharmacists， nurses， patients or their families were 97.58％， 1.45％ and 0.97％， respectively. CONCLUSIONS： Further strengthening information system and the on-the-job training for physicians and pharmacists can reduce the ME to some extent.