Internet economy as a sum of internet-based economic activities comes from the deep integration of internet technology and economic activities. Internet economy is supported by information technology and theoretically based on new economics theory. Currently, internet economy mainly includes five types: e-commerce, internet finance, instant messaging, search engine and online game. This class provides detailed information on these five types of Internet economy. It can be said that except for its great influence on the economy, internet has completely changed Chinese people's life too. COVID-19 broke out worldwide in 2020, which had a serious impact on the global economy. In the process of China's fight against the epidemic, the government, an important participant in the Internet economy, has achieved a phased leap in governance through digital means. And in the context of the global fight against the epidemic, China has created a number of "Chinese speeds" records. We believe that after the epidemic, China's Internet economy will surely enter the track of rapid development again, and contribute Chinese wisdom to the development of the world's Internet economy. Welcome to China and personally experience the good life brought about by the Internet economy!