"Three-stage" has stricter requirements for teachers' teaching design, and the design process should consider not only teachers, students, technology, media, but also knowledge content and other factors. Most teachers lack the idea of teaching design, and the process of teaching design is just a form, which only pays attention to the design of classroom teaching and ignores the process of pre-class preparation and students' autonomous learning. In the process of teaching design, teachers basically focus on the content of classroom teaching, and rarely take into account students' preview and knowledge consolidation and extension, so students can't make good use of their extracurricular time for learning. Using conventional network communication tools, such as QQ space, blog or online learning space, which are easy for students to accept and be familiar with, upload preview requirements, teaching design, key and difficult points, teaching resources and knowledge expansion to the space (not just copies of text textbooks) to facilitate students to preview, so that students can know how to preview and learn independently before class, which is very helpful to classroom teaching effect.

(2) classroom teaching

Judging from the current situation of information technology application of primary and secondary school teachers, more than 95% of teachers' information technology application only stays at the level of classroom teaching (here refers to teachers who are used for teaching, not to mention useless), and most of them are only used for the presentation of teaching content, such as graphics, pictures, videos and sounds. However, some schools with better conditions try to use online classrooms to complete the classroom teaching process, which is only a change in form.

Knowledge and understanding of the application of information technology in teaching Most teachers still stay in open classes, competitions, lectures and teaching and research activities. It really needs a lot of work to make all teachers know, understand and use it correctly in teaching. Therefore, the application of information technology should be forward-looking, especially the concept should be moderately advanced. Classroom teaching is still the main battlefield of information technology application, and information technology should be made to play a real role in teaching as much as possible.

"Three-stage" classroom teaching: students exchange learning experiences with each other in the classroom, each student puts forward his own problems and gains in the process of autonomous learning, and teachers solve and answer questions. Students actively participate in this process, and teachers are only participants and instructors in this process, which truly embodies the new curriculum concept of teacher-led and student-centered. This kind of classroom teaching is much better than conventional classroom teaching in cultivating students' ability, and it will be easy to achieve the three-dimensional goal.

3) After-class reflection: Teachers' teaching reflection, students' learning experience, and the consolidation and extension of knowledge are presented in the space of teachers or students in different forms, and teachers and students can exchange visits in real time. For example, the happy composition blog of Longsha Primary School belongs to the expansion and extension of after-school knowledge. The participation of teachers, parents and students is of great help to the improvement of students' writing ability.