The Internet has become an indispensable part of people's lives. The Internet is widely used in real life. On the Internet we can chat, play games, look up things, etc. More importantly, advertising and shopping can also be carried out on the Internet, which brings great convenience to our real life. On the Internet, we can find our academic and career needs in the digital knowledge base to help us work and study. Computers can be used for multimedia learning, playing games, watching TV, watching the news, and searching for information. However, it is not a good thing to overdo it. Just like what is said in our junior high school politics books, the Internet is also a double-edged sword, with pros and cons. It varies from person to person. During school, we are always addicted to games and do not know how to use the Internet to study. However, because of the Internet, students from many families can study through the Internet. In order not to delay the progress of students' learning, many schools Online teaching is conducted, but many students increase the time they spend online after online teaching. Long periods of time online will affect our health, some bad information transmitted online, and the safety and reliability of online shopping. While it expands people's communication space, does it also cause difficulties in communication between people in real life? Computers will affect our vision. If we look at the computer screen for a long time and do not allow our eyes to take a proper rest, This will affect our vision, so in my opinion it will do more harm than good.