Facing the recent nine-year consistent curriculum reform in Taiwan, teachers become curriculum developers. They need to be self-reflective and try to learn how to progress through self-reflection. Therefore, the concept and practices of “teachers as curriculum evaluators” are useful in promoting ongoing curriculum reform. Only when curriculum evaluation becomes a part of teachers teaching career, will the motivation power generated by evaluation be long-lasting to give continuous impetus to curriculum reform. The research entered a school and cooperated with teachers to evaluate curriculum in order to understand the ideas of teachers in cooperation evaluation (including curriculum evaluation indicators interpretation, developing curriculum evaluation tools, and practicing curriculum evaluation). The results of the research are as follows: firstly, the concept of “Teachers as curriculum evaluators” is applied, but the assistants of professional researcher is necessary. Secondly, when teachers can evaluate curriculum, the professional researcher shall leave teachers. Thirdly, teacher can understand the meaning of curriculum through evaluating curriculum. Fourth, teachers expand their awareness about curriculum through evaluating curriculum. The last, teachers improve the self-understanding and professional development by reflection and discussion in curriculum evaluation.