The purpose of this study was to investigate the effect of planning, microteaching, and reflection process for educational play on the improvement of perception on instructional design and teaching professionalism of early childhood teachers’. The subjects of this study were 38 pre-service early childhood teachers who took the [language education for early childhood] at N city. In order to examine perception and its improvement on instructional design and teaching professionalism, the researchers surveyed the subjects and open questions were analyzed to explore changes. The study found that, first, all the subjects felt difficulty and burden in making up the instructional planning, and that the most important element of the instructional planning was perceived by the interest of early childhood. Second, the difference in score of perception of instructional design between before and after recognition of the importance of instructional objectives was statistically significant. Third, the pre-service teachers saw their microteaching video centered on the revised the 2nd instructional planning and evaluated the whole instructional course, which showed that confidence in the instruction. Fourth, the results of comparing the changes in the total score of teaching professionalism and sub-area scores to examine the impact of systematic instructional design based on objectives and the impact of reflection on the change in the perception of teaching professionalism showed that the scores of prospective teachers perception of teaching professionalism had significantly increased since the implementation of goal-oriented systematic instructional design and reflection process. Through this study, it can be emphasized that the systematic instructional design experience of pre-service early childhood teachers is the foundation for the implementation of learning through play emphasized in the revised Nuri curriculum.