The purpose of this study is to enhance 4th grade primary school students writing motivation and writing competence by providing feedback based on motivation-promoting strategies. It is important to encourage students writing motivation as students fear writing, and motivation plays a key role in learning English. This study utilized Keller (2010) s ARCS motivational model, which consists of attention (A), relevance (R), confidence (C), and satisfaction (S) to plan, execute, and retrospect on learning. 18 students participated in the study by drafting 5 times and revising 4 times. Feedback was constructed based on the motivational model and its strategies. To explore the impact of motivational feedback, students pre- and post- motivation survey and writing were collected. Also, 5 students were selected to investigate the effect of motivational feedback more in depth. The results of this study were as follows. First, giving feedback considering the 4 motivational factors significantly improved learners writing motivation and their writing. Therefore, English writing teachers should consider using motivation enhancing feedback strategies to meet the needs of students and to assist young learners writing. Second, level-adjusted indirect feedback was adequate for students writing. Even 4th grade primary school students could successfully understand and apply indirect feedback. If feedback is appropriated, there is a possibility that students can understand and utilize both direct and indirect feedback. Third, positive feedback should be fully taken into consideration. These results suggest that providing feedback based on motivation encouraging model and its strategies is an effective way to enhance English writing motivation and writing competence.