Currently, the design and organization of project-based teaching is a practical matter, which has been widely applied to help learners acquire the necessary knowledge and skills to apply to specific and practical issues. In project-base teaching, theoretical knowledge is intergrated into practice to help learners practice how to apply theoretical knowledge to real life topics and situations. That will help students grasp the practical meaning of knowledge, and step by step understand how to apply it in practice and solve real-life problems. One of the current urgent problems that need to be researched and solved is the problem of environmental pollution caused by climate change. Therefore, in this study, environmental issues are integrated into the curriculum, the research topic is the solar cell project taught in the form of a project-based at high schools. From the results of experimental pedagogical research, the effectiveness of teaching solar cell-theme projects at some high schools is evaluated.