To be an excellent teacher, solid professional knowledge is essential. Teachers' professional knowledge includes general cultural knowledge, subject knowledge taught, educational subject knowledge and practical knowledge. This paper will discuss these four aspects of knowledge in depth to help readers better understand teachers' professional knowledge.

General cultural knowledge

Teachers need to have extensive general cultural knowledge and become a treasure chest of knowledge. This knowledge can help teachers better understand the world and provide students with more knowledge background and perspectives.

Professor's subject knowledge

Teachers need to be proficient in the knowledge of the subjects they teach and lead students into the subject field. Only by deeply understanding the essence and connotation of the subject can we better teach students and stimulate their interest in learning.

Educational subject knowledge

The subject knowledge of education is teachers' conditional knowledge, which enables teachers to better grasp the educational laws and teaching methods. Only by deeply understanding the theory and practice of education discipline can we better guide students' learning and growth.

Practical knowledge

Practical knowledge is based on the accumulation of teaching experience, which makes teachers' classes more lively and interesting. Only by constantly summarizing and reflecting in practice can we continuously improve the teaching level and provide better educational services for students.