Educational theory plays a very important role in teaching. Teachers' knowledge literacy includes not only professional knowledge and practical knowledge, but also political theory cultivation, scientific and cultural knowledge and educational scientific knowledge.

Among them, the knowledge of educational science is that people have accumulated rich practical experience in teaching and education through thousands of years of educational practice. On the basis of summarizing these experiences, people have revealed the laws of education and teaching, put forward systematic principles and methods of education and teaching, and formed a systematic educational theory. Teachers must master these theories in order to strengthen the scientificity and effectiveness of education.

Pedagogy is also different from the compilation of educational experience. It is important for people to learn educational experience, but what they want to learn is the spiritual essence of educational experience, not the operating procedure of mechanically copying educational experience. Of course, pedagogy is inseparable from the practical experience of education. We should sum up educational laws, educational ideas and even educational art from educational experience, and raise the practical experience of education to a theoretical level, thus enriching and developing pedagogy.

The purpose of pedagogy's scientific explanation of educational problems is to promote the growth of educational knowledge, but it is not limited to the growth of educational knowledge. Scientific understanding of communicative education is not only the objective requirement put forward by educational practice, but also the need to finally return to educational practice. So education itself is a practical science.