The second classroom is relative to classroom teaching. If according to the teaching materials and syllabus, the classroom teaching activities carried out within the specified teaching time are called the first classroom, then the second classroom refers to the teaching activities related to the first classroom outside the first classroom. From the perspective of teaching content, it comes from teaching materials, not limited to teaching materials; It does not need an exam, but it is an indispensable part of quality education. Formally, it is lively and colorful. Its learning space is very broad: it can be in the classroom or in the playground; Can be in school, but also in society and family.