This research investigated the relation between reflective journal writing with focus and teachers' professional growth. The researcher observed three preschool teachers' performances on selected professional criteria, set up informal interviews, and collected reflective journals to explore contents of the teachers' professional growth. The results showed that focused reflective journal writing could channel the direction of teachers' professional growth. At the same time, teachers who were able to write journal in depth showed better performance on selected professional criteria. Finally, the reflective journals should present teachers' inadequacy then the professional teaching could be improved. The results provide the practical suggestions for teachers to write the reflective journals.