The purpose of this study is to analyze nursing students` proficiency with ST(Systems Thinking) approach concerning asthma patient nursing process. For this study, 20 nursing students created causality cognitive maps which were consisted of the contents of ‘asthma nursing care``. The word association and causality cognitive map were used to estimate ability of the ST. As a result, the students failed to understand the nursing process with the ST approach, or alternatively they applied low level ST approach and had a lower understanding of it. The findings of this study suggest that the development of a ST-based nursing educational program in order for nursing students to improve their ST ability as well as knowledge integration for multidisciplinary practice.