This study investigates the differences in the problem solving ability and clinical performance competency by learning style of nursing students. And this study analysis the effect of problem solving ability on clinical performance competency of nursing students. The data was collected from nursing students through a structured questionnaire. The statistical analysis methods were frequency analysis, reliability analysis, ANOVA, and multiple regression analysis. The learning style of nursing students was classified by the diverging, assimilating, converging, accommodating, and it was diverging 24.7%, assimilating 34.4%, converging 26.0%, accommodating 14.9%. The problem solving ability was classified by the confidence, approach-avoidance style, and personal control. Also, the clinical performance competency was classified by the nursing process, nursing skills, education/cooperative relations, interpersonal-relationships/communication, and professional development. There were significant differences in the problem solving ability and clinical performance competency by learning style of nursing students. The diverging was showed the highest score in the problem solving ability and clinical performance competency. The confidence and approach-avoidance style of the problem solving ability influenced the nursing process, nursing skills, and professional development. The confidence of the problem solving ability influenced the interpersonal-relationships/communication, and the approach-avoidance style influenced the education/cooperative relations. Specially, approach-avoidance style of the problem solving ability was important factor for the clinical performance competency. The results of this study will provide useful data on the nursing education through problem based learning and clinical practice.