The rapid development of information technology has brought about radical changes in school education. The traditional teaching methods used in the past were very homogeneous and basically consisted of teacher's dictation with the aid of blackboard chalk. With the development of science and technology, there are more and more intelligent devices, and classroom teaching is changing day by day. Students often report that mathematical knowledge is too abstract and that mathematical subjects in school education are useless in real life. This article attempts to compare two teaching designs on parabolic knowledge at different times, to analyse the role of information technology in mathematics teaching, and to reflect on the possible problems of information technology in mathematics teaching.