In recent years, the evaluation of the educational quality of the high schools in Tay Ninh province has been paid significant attention by the administrators, the quality of education and training at all levels, especially the high school level, gets better day by day. The article outlines the current situation of management of external assessment in high school education quality accreditation in Tay Ninh province in order to improve the management and educational organization of quality self-assessment activities in high schools in the area, resulting in the ability to develop and advance, contributing to improving the quality of education.