Question situation is an effective teaching strategy to induce students to think and promote students' subjective participation, and it also plays an outstanding role in cultivating students' cooperative ability and innovative thinking ability. To successfully implement problem-based situational teaching, we must follow certain principles, take the effectiveness of classroom teaching as the starting point and destination, and strive to innovate creative strategies to better serve teaching and student development. (1) pertinence. When creating problem situations, we must stick to the theme, don't be mysterious, don't go too far from the topic, reveal mathematical concepts or laws, directly help solve problems learned in class, stimulate students' enthusiasm for thinking, and reflect the typicality of problem situations. (2) appropriateness. The design of problem situation should proceed from reality, take into account the cognitive level of most students, face all students, and not design for a few people. We should not only consider the teaching content but also the differences of students, pay attention to prompting students with the angle and method of setting questions, and let each student develop from the teacher's situational design teaching. (3) enlightening. The question is not how much, but whether it is enlightening, whether it can touch the essence of the problem and guide students to think deeply. First of all, students should be given some time and space to think, and they can be appropriately inspired and guided when necessary. Teachers' inspiration should follow students' thinking rules, and students should not be forced to think according to the methods and ways put forward by teachers. (4) interactivity. The design of problem situation should make students constantly ask new mathematical questions and new questions with research value, let students constantly construct new knowledge, keep the continuity of thinking, and really let students participate in the classroom all the time, instead of waiting for the emergence of problems.