The Ministry of Education in the ROC has enforced the "9-Year Joint Curricula" plan since 1999 in order to comply with the worldwide trend of educational reform, to meet the needs of national development, to improve education quality, and to upgrade national quality and competitiveness. Basically, the new curricula plan is child & student oriented instead of traditional adult & teacher approach. It particularly emphasizes curricular integration and collaborative teaching. Under the circumstances, the classroom space needed for new curricula is surely different from the conventional one. The purpose of this study is to examine the usage status and problem of regular classrooms in those elementary schools implementing the "9-Year Joint Curricula" plan. In this study, regular classrooms are classified into conventional and open ones. After having investigated five examples of 1st and 2nd grades of Taipei City's Type B elementary schools, this study found that the space is limited and closed in the conventional classrooms and doesn't meet the needs of ongoing diverse teaching. There are insufficient teaching aids and coordinating facilities in the conventional classrooms. Furthermore, failing to provide any research room for the teacher groups, the conventional classrooms limit teachers' cooperation and interaction. On the other hand, although the open classrooms generally meet the needs of new curricula and have more versatile, flexible, and sufficient facilities, they still encounter problems of teaching interference, space insufficiency, inconvenience in operating movable partitions, and so on. According to these findings, this study proposes suggestions for improvement in aspects of usage rules, spatial composition, usage area, facilities, and teacher's research room. It is expected that a quality environment for the education of our future citizens will result and the goal of educational reform will achieve.