The purpose of this study is to develop "teaching materials using clay" in arts and crafts lesson. The method used was a consideration of pupils' thoughts and performance in activity, after conducting a lesson practice using clay for 1st grade elementary students. Findings reveal that the teacher can plan and do the creative activities gradually from the beginning of the clay lesson and pupils become interested in clay and do the activities by trial and error. Implications of this study are discussed to investigate pupils' consciousness and actual condition for clay in different schools, to develop teaching materials that enable effective clay lesson regardless of school's facility equipment, and to draw up 6 year curriculum in the light of developmental stage for future study.