Objective　To observe whether Mini-Clinical Evaluation Exercise (Mini-CEX) is effective and feasible for improving the clinical competency of residents receiving standardized training. Methods　40 residents receiving standardized training in the Second Affiliated Hospital of Amy Medical university were randomly divided into control group and experimental group

with 20 trainees in each group. From October 2015 to April 2018

the experimental group was trained by the traditional teaching methods combined with Mini-CEX

and the other was trained by traditional teaching method. At least 2 Mini-CEX were conducted for each trainee of the experimental group in each department. The Mini-CEX

defense of case report and OSCE evaluation were carried out to assess the clinical competence of residents after the standardized training. Satisfaction surveys were conducted for teachers and students who had used Mini-CEX. SPSS 18.0 was used to analyze the data. Independent samples t test was used for inter-group comparison and paired sample t test was used for intra-group comparison. P<0.05 was statistically significant. Results Mini-CEX showed that the scores of the two groups in the clinical competence assessment were improved; the scores of the experimental group were higher than those of the control group

and the improvement in scores of experimental group was higher than that of the control group (the differences were statistically significant

P<0.05). The average score of defense of case report of the experimental group was (81.16±3.75)，while that of the control group was (70.13±3.88) (t=-9.140

P=0.000). The average total score of OSCE evaluation of the experimental group was (96.300±4.681)

while that of the control group was (91.775±3.227) (t=-3.559

P=0.001). Satisfaction rate of teachers and students were 95.0% and 92.5% respectively. Conlusion　Mini-CEX can improve the clinical competence of residents receiving standardized training.