I. Introduction
STEM education has gradually developed in China. Many schools and institutions have designed and enacted various STEM courses. However, there are still many problems in the localization and development of STEM courses in China. For example, researchers and practitioners do not have a clear understanding of STEM education; there lacks theoretical guidance to the design and development of STEM curriculum; STEM curricula are not designed and developed in a systematic way [1]; existing STEM curriculum only showed some superficial features of the integration of different learning models, and ignored the integration of interdisciplinary knowledge, falling into a mechanical and simple assembling of learning models, and became "pseudo-integrated" curriculum [2]; many STEM curriculum has failed to promote students' deep learning [3]. One possible reason that causes these problems is that China’s basic education has long been confined in the "examination-oriented" trap and lacks the experience of integrating engineering and technology education in schooling [4]. From practical perspective, these issues originate from lack of understanding on how to develop STEM curriculum. Therefore, it is urgent to study the design and development of STEM curriculum.