The connotation definition and structure division of teachers’ professional identity are important theoretical issues. Teachers’ professional identity refers to a process in which the individual teacher establishes a consistent relationship between the cognitive subject of professional self and professional self. Teachers’ professional identity is a multi-dimensional and multi-level structure composed of teachers’ professional cognition (professional-material self, professional-social self and professional-spiritual self), teachers’ professional emotion (sense of professional acquisition, sense of professional belonging and sense of professional mission) and teachers’ professional behavior tendency(professional-survival behavior tendency, professional-existence behavior tendency and professional-life behavior tendency).