The origin of knowledge payment can be traced back to the period of Confucius, when asking questions to Confucius required a dozen pieces of dried meat as a question fee. Nowadays, with the arrival of the wave of knowledge economy, there are more and more ways to pay for knowledge. You have to pay copyright fees to listen to songs on the APP, and the habit of watching dramas on the computer and storing e-books to buy members has also been replaced by buying e-books on the kindle. Tencent, which used to build its own media content ecosystem with WeChat official account, also confirmed that it will launch the paid subscription function of WeChat official account in the near future, and the spring of knowledge payment is beginning. "Payment is becoming a new filter of knowledge." Fang Jun, a veteran Internet practitioner, commented on the key reasons for the popularity of paid content.