The content of elective module 4- 1 "Selected Lectures on Geometry Proof" has been deleted from the syllabus of 20 17 mathematics examination, which embodies the guidance of pruning, reducing repeated examinations and strengthening the subject system. The direct reason for deleting the module of "Selected Lectures on Geometry Proof" in the examination content is that this part examines the knowledge of plane geometry in junior high school, and the main knowledge of geometry is embodied in solid geometry and analytic geometry, so it is not necessary to list it as a special examination separately. At the same time, this part is not in the past syllabus and the curriculum standard revised by 20 17. In fact, this also reflects a deeper understanding of mathematics education.