This article presents the results of a study of teachers' professional standards in countries that consistently perform well according to PISA results, including China (Shanghai), Singapore, Canada (Ontario), Finland, England, and New Zealand. In order to find an answer to the question of what makes professional standards a development instrument of teachers' professional skills, practices of design, implementation, and development of teachers' professional standards were studied. The study included an analysis, comparison, and identification of common and unique features of professional standards for teachers in the leading countries, as well as methodological materials, recommendations, and documents publicly available on the websites of ministries (departments) of education and higher education institutions of the countries studied. Analytical reports, reports, newsletters and methodological materials published by international organizations on professional standards in education and professional development of teachers - World Bank, Organization for Economic Cooperation and Development, National Center for Education and Economics, McKinsey & Company, SEAMEO INNOTECH, Research Institute of International and Comparative Education, Economic Forum "Asia-Pacific Economic Cooperation" were reviewed to study the experience of applying professional standards. The study identified characteristic approaches to the development of professional standards, which allow its application as a mechanism for solving the problems of educational policy of the country (territory); increasing the teacher’s status of and the prestige of the profession; teacher’s career and professional growth; formation of a system for evaluating the teacher’s professional development; formation of ethical standards of the profession. The results and conclusions of the study can be the basis for the development of professional standards in education and modeling the system of teacher growth.