1. Practical research on the effective use of students' learning starting point: what is students' learning starting point, what are the different types of research on learning starting point in mathematics teaching, and how to find and effectively use students' learning starting point: case study of students with learning difficulties who are weak in mastering mathematical concepts, calculating skills or solving problems, how to conduct targeted counseling research on students, and research on the causes and countermeasures of "polarization" phenomenon. 3. Research on the homework design of basic investigation before primary school mathematics class. 4. Research on optimizing students' mathematics learning process.