Teacher professional standards are an important benchmark to measure the professional level of teachers, which covers three main dimensions: professional knowledge, professional competence and professional ethics. These three dimensions are closely linked and together form the core framework of professional standards for teachers. First of all, professional knowledge is the foundation of teachers' professional standards. Teachers' knowledge of the subject and educational theories is a prerequisite for their effective teaching. Subject knowledge is the basis for teachers to design courses, write teaching materials, and organize classrooms. This means that a good teacher must constantly deepen and update his subject knowledge to adapt to the rapidly evolving educational environment. At the same time, the knowledge of educational theory is a guide to teaching practice, which helps teachers to better understand students and grasp the teaching rules, so as to improve the teaching effect. 
Second, professional competence is another key element of teachers' professional standards. Instructional design ability, teaching implementation ability, teaching evaluation ability, organization and management ability constitute the professional ability of teachers. These competencies are key to the success of teachers' teaching and learning. A teacher with excellent professional competence can flexibly use different teaching methods and means according to the personality characteristics and needs of students to stimulate students' interest and promote their learning and development. Finally, professional ethics is the moral cornerstone of teachers' professional standards. Respect for students, fairness and fairness, integrity and trustworthiness constitute the professional ethics of teachers. A teacher with professional ethics should lead by example and influence students with noble morals and behaviors to promote their healthy growth. At the same time, teachers should respect the rights and dignity of students, protect their privacy and safety, and treat every student fairly and equitably, without favoritism or discrimination. 
In summary, the three dimensions of professional knowledge, professional competence and professional ethics are interrelated and mutually influential. Professional knowledge is the foundation, professional ability is the key, and professional ethics is the guarantee. An excellent teacher must reach a high level in all three aspects in order to truly play the professional role of teachers and promote the all-round development of students. The improvement and improvement of these three dimensions is of great significance for improving teachers' professional quality and teaching quality. In practice, in order to improve the professional level of teachers, we need targeted training and guidance in these three aspects. First of all, we need to strengthen the training of teachers in basic subject knowledge and educational theory knowledge, so that they can better adapt to the needs of educational development. 
Secondly, we need to improve teachers' professional capabilities, including instructional design capabilities, teaching implementation capabilities, teaching evaluation capabilities, and organization and management capabilities. This can be achieved through teaching seminars, observation of the teaching activities of outstanding teachers, and training in teaching skills. Finally, we need to strengthen teachers' awareness of professional ethics and improve their moral literacy by carrying out teacher ethics education, holding moral lectures, and formulating strict teacher code of conduct. In addition, in order to ensure the effectiveness of the implementation of teacher professional standards, we need to establish a sound evaluation mechanism. The evaluation mechanism should include an evaluation of teachers' professional knowledge, professional competence and professional ethics, and use this as a basis to measure teachers' professional standards. At the same time, the evaluation results should be used as an important reference for teacher promotion, reward and training, so as to motivate teachers to continuously improve their professional quality. 
In conclusion, the three dimensions of teachers' professional standards: professional knowledge, professional competence and professional ethics are of great significance for improving teachers' professional standards. We should start from these three aspects, strengthen the training and guidance of teachers, and establish a sound evaluation mechanism to promote teachers' professional development and improve the quality of education.