National Academy for Educational Research (NAER) started a 3-year research of curriculum transformation after twelve-year basic education curriculum guidelines had been announced in 2014. Ten elementary schools joined in the research and attempted to implement the concept and connotation of the new curriculum. School members reported that they had new understanding and doubts to the curriculum connotation during continuing and renewing their curriculum and instruction. For further exploration, this study employed questionnaire to explore the situations and reflections of twelve-year basic education curriculum implementation that included the school leaders and core team teachers’ understanding of new curriculum, their plan and design of school curriculum, schools’ preparation for the “Directions for Implementation”, and their difficulties and problems. Based on the results, this study raised several suggestions for promoting the new curriculum implementation.