Purpose of this study was to identify the effects of a clinical basic nursing practice of the nursing students on the clinical competency.Method: The subjects of this study were 154 fresh nursing students(experimental group) in second semester of G college who have had the clinical basic nursing practice in a clinical setting, and 148 fresh nursing students(control group) in second semester of A college who have not had the clinical practice. Data for this study were collected from September 19 to December 5, 2001 with a questionnaire which was consisted of three measuring tools, these are Basic Nursing Skills (36 items) of Yoo(1992), Teaching / Coordinating (6 items) and Professional Attitudes (7 items) of Lee et al.(1990), and Self-esteem (10 items) of Ronsenberg(1965).Result : 1) The experimental group showed statistically significant higher clinical competency than the control group.2) Moreover, the experimental group showed the higher scores than the control group significantly in all the detail areas, those are basic nursing skill, teaching & coordinating, professional attitudes and self esteem.Conclusion : As the results of the study shown, the clinical practice on basic nursing for fresh nursing students in second semester of college shall contribute to develop their clinical competency. So Nurses graduating from college with the higher clinical competency are expected, if the clinical institutions and nursing colleges try to cooperate in this area continuously.