Nursing practice in clinical situation of nursing students must be used problem-solving skills. However, many students could not use basic knowledge to make decision on nursing care. This research aims to study the effects of learning by reflective thinking diaries on problemsolving nursing skills. The samples included 102 of fourth year nursing students, with fifty-one members in each group. Both groups were assigned the task of planning for daily nursing care for high risk pregnant women and writing case study reports. The experimental group was established by writing Gibbs’ reflective thinking cycle and mind maps diaries. The results showed that the abilities of analysis of thoughts and feelings, situation description, and develop professional practice skills within experimental group increased significantly, while the control group increased only their ability to describe situations (p<0.05). The problem-solving skills among control and experimental groups was significantly difference (p<0.05). There were significant differences in analyzing thoughts and feelings, and ability in develop professional practice. The opinion of reflective activities highest scores is learning helped to gain more understanding and association between theory and practice. The findings indicate that students had improved nursing competency by learning reflective thinking and helped them in decision making on nursing care.
