The Curriculum Guidelines of 12-year Basic Education has been implemented since 2019 academic year, and the Competency-based curriculumis the key point of this guidelines. Therefore, this study aims to explore the implementation and enactment of curriculum guidelines in the elementary schools, including the current situation, operational mechanism and critical factors for curriculum leadership, curriculum development and evaluation, teacher curriculum profession, the supportsystemand resource of curriculum developments.First, this studygrasps the current situation and problems of the 2019 curriculum guidelines in the elementary schools. Second, the researcher exploresthe operational mechanism and critical factors of the competence-based curriculum implementation in the elementary schools. Besides, the findings and suggestions will be provided for the appropriate practices of the competence-based curriculum implementation and enactment in the elementary schools.?