First, flip the classroom: First, let the students complete the knowledge self-study at home, and the classroom becomes a place where teachers, students and students interact, including answering questions and applying knowledge, so as to achieve better educational results. 2. Difference: The traditional teaching mode is that teachers give lectures, assign homework and let students go home to practice. Different from the traditional classroom teaching mode, flip teaching actually reverses the main structure of traditional teaching. Three. Four characteristics of flipping the classroom: First, the teaching video is short and pithy. Whether it's salman khan's math tutorial video or Jonathan Boehlmann's and Aaron sams's chemistry teaching video, the same feature is short and pithy. Most videos are only a few minutes, and longer videos are only ten minutes. Each video is aimed at a specific problem, which is highly targeted and easy to find. Video length control is within the time range that students can concentrate, which accords with the characteristics of students' physical and mental development; The video released through China Network has many functions, such as pause and playback. It can be controlled by itself, which is beneficial to students' autonomous learning. Second, the teaching information is clear and definite. A remarkable feature of salman khan's teaching video is that the only thing he can see in the video is his hand, which keeps writing some mathematical symbols and slowly fills the whole screen. In addition, it is a voice-over explained by words. In salman khan's own words: "Well. I don't seem to be standing on the podium giving you a lecture. It makes people feel intimate, just like we are sitting at the same table, studying together and writing the content on a piece of paper. " This is the difference between the "flip classroom" teaching video and the traditional teaching video. The teacher's head in the video and all kinds of objects in the classroom will distract students' attention, especially when students study independently. Third, reconstruct the learning process. Usually, students' learning process consists of two stages: the first stage is "information transmission", which is realized through the interaction between teachers and students; The second stage is "absorption and internalization", which is completed by students themselves after class. Due to the lack of teacher's support and peer's help, the stage of "absorption and internalization" often makes students feel depressed and lose their motivation and sense of accomplishment. "Flipping the classroom" reconstructs students' learning process. "Information transmission" is carried out by students before class. Teachers not only provide videos, but also provide online tutoring. "Absorption and internalization" is accomplished through classroom interaction. Teachers can know students' learning difficulties in advance and give effective guidance in class. The mutual communication between students is more conducive to promoting the absorption and internalization of students' knowledge. Fourth, reviewing exams is convenient and quick. After watching the teaching video, did the students understand the learning content? The video is followed by four or five small questions, which can help students test in time and judge their learning situation. If you find that several questions have not been answered well, students can go back and look at them again and think carefully about what went wrong. Students' answers to questions can be summarized and processed in time through the cloud platform to help teachers understand students' learning situation. Another advantage of teaching video is that it is convenient for students to review and consolidate after studying for a period of time. With the follow-up of evaluation technology, students can get empirical data in the relevant links of learning, which is beneficial for teachers to really understand students.