Science education emphasizes "learning by doing", and "reflection of light" and "planar mirror imaging" are the key and difficult points of middle school science teaching. There is continuity and logic between the two knowledge points. However, the lack of integrated teaching aids in current textbooks effectively presents the two knowledge points. This study is based on the requirements of the new curriculum standards and analyzes the current situation of self-made teaching aids in junior high school science optics. Based on the content of the textbooks and the current research status, innovative improvements have been made to the "reflection of light" teaching aids using the merging and extraction principles in TRIZ theory, combined with readily available materials in daily life. An integrated teaching aid that can be used to explore both light reflection and planar mirror imaging has been developed. This teaching aid is easy to obtain and adopt, connecting two exploratory experiments, breaking through experimental related problems, promoting students' deep understanding of light reflection and planar mirror imaging, and enhancing students' core literacy.