It is an important strategic goal and task for China's contemporary educational reform and development to train high-quality and professional teachers. Identification and grasp of mathematics core literacy need high-quality teachers toplay a role. It was noted that the tendency of examination-oriented teaching in high school mathematics is obvious. Curriculum development ability is insufficient and their teaching methods are single. All these have affected the improvement of teachers' teaching ability. The ability of subject teaching of mathematics teachers is the core that distinguishes from other subject teachers. Subject teaching ability is the most fundamental embodiment of teachers' professional ability, which can be enhanced through classroom teaching practice reflection and school-based teaching research.