Abstract: Problems in teaching are very important for the development of students’ thinking. However, the simple way of thinking of some teachers,as well as the misunderstanding and misuse of problems, produced a lot of chaos in teaching. It's necessary for teachers to comprehend problems in teaching from multiaspects. By constantly asking “what is problem in teaching”,“why we need problems in teaching”,“what kinds of problems are much valuable for students’ thinking development”,“what is the condition for value maximization”, we may grasp the essence and characteristics of problems in teaching , choose and design problems of much value in teaching ,and sincerely invite students to put forward and solve valuable problems for thinking development . In order to promote the development of students' thinking, it is necessary for teachers to rationally think over and fully prepare for problems in teaching.

Key words: problems, students&rsquo, thinking development, teachers, comprehension, reflection