ln order to deepen the reform of basic education teaching, change the teaching method and explore the penetration of project-based learning in basic education, in the teaching of “iron and its compounds” the evaluation gauge is set to provide the direction for students to improve the learning content and methods. The theme of “Scientific understanding of iron supplement” is to let students feel and understand in the real situation and the significance of knowledge, promote the deep understanding of the core knowledge of chemistry, establish the relationship network of the experience that chemistry comes from life and serve our life, gradually develop the core literacy and provide reference for comprehensively improving the quality of teaching.