1. Primary education and scientific research, as a part of China's higher education, is a self-study exam. Its duty is to advocate, encourage, help and promote self-study at higher education level, paving the way for every self-learner. Organizing the compilation of teaching materials for readers is an important part of fulfilling this responsibility. Undoubtedly, this kind of teaching material should be suitable for self-study, help learners master and understand new knowledge and information, help learners enhance their innovative consciousness, cultivate their practical ability and form their self-study ability, and also help learners apply what they have learned and solve problems encountered in practical work.

2. Carrying out educational research in primary schools has the following significance: (1) Improving educational practice, that is, finding effective educational contents, methods, means and organizational forms through educational research; (2) Promoting theoretical construction is to provide factual basis for revealing the laws of educational activities and exploring the general laws of education; (3) Improve teachers' quality, that is, improve teachers' theoretical literacy and scientific research ability by attracting teachers to participate in educational research.