1, the positioning of the course, we must first understand the needs of the audience, students in the K 12 stage, the purpose of online learning is not to make up for differences, if it is to make up for differences, then the content of the course should be structured to help students improve their overall level. If it is high, it is necessary to strengthen it in a targeted manner and highlight the advantages of students.

2. Course time and classroom structure. In either case, students should be considered to be in the mood and have no time to go to class after one day at school, which requires short time. A class can be divided into several sections, each of which takes 15-20 minutes and 5-7 minutes to solve a problem. Structurally, examples can be arranged to explain (positive examples, counterexamples, variants)+links to the real questions of the college entrance examination in primary and secondary schools, which can be understood from the examples and applied to the real questions to form a complete learning process.

3. Instructional design must have an interactive link with students. No matter which method or form, the first link of teaching is to establish emotional connection with students. In online teaching, the teacher's image has an important influence on the teaching effect, which has been confirmed in both infant learning and adult learning experiments, but attention should be paid to switching with the content screen.

4. The combination of elements and the switching rhythm of screen content should conform to the principle of online learning, with soft colors but not fancy, no irrelevant sounds and animations, and the main content should be displayed in dark or dynamic colors to attract students' attention. The single screen display time should not exceed 2 minutes (think about the feeling of waiting for a red light), and the content that needs to be displayed for a long time can be presented step by step. You can't switch too fast. It's better to switch every minute 1 time. It's too fast for students to see clearly or remember. (About Courseware)

5. The language and pictures of the lecture should conform to the information channel theory, and students are required not to explain when they are watching attentively. When the teacher's image appears, explanatory language should not be displayed in words, which will increase the cognitive load of students' visual channels. The outline of the explanation, or formula theorem and key words should be displayed in words, which is convenient for students to process and remember for a long time.

6. Online teaching is different from traditional preaching and teaching. It can be more popular, rigorous and humorous, which can not only reflect the professionalism of students, but also make students interested in learning. The easiest way is to set up a reward mechanism, such as praise, so that students have the motivation to learn. If you are an independent teacher, you should also have after-school service and know how to maintain students.