Online education is a technical means to transfer the traditional teaching field to online，which has a far-reaching impact on the traditional form of education. Based on the analysis of survey data，this chapter compares and analyzes the online education before and after the epidemic from the two dimensions of in class and out of class. The findings of this paper are as follows：（1）whether in class or after class，minors complete learning tasks and expand their knowledge is the main goal of using the network；（2）Minors have a dual attitude towards online classes. On the one hand，they have a high degree of acceptance of online classes，on the other hand，they still prefer offline teaching. While affirming the teaching effect of online classes，they also prefer offline interaction；（3）Parents will play a supervisory role in their childrens online classes；（4）Minors’ evaluation of online classes is generally more objective. On the one hand，they recognize the convenience and repeatable viewing characteristics of online classes. On the other hand，they have also encountered many problems such as vision damage，difficulty in concentrating，inability to communicate and feedback in time. Online classes also have high requirements for hardware and network environment；（5）Students of different grades and families will also show significant differences in online classes. Minors living with their parents（at least one party）have better learning effect，while senior students have lower acceptance of online classes and relatively poor learning effect.