In 2020，China’s online documentaries are developing steadily. The major platforms continue to increase their investment in documentaries. Compared with 2019，the number of new online documentaries in China has increased substantially. 2020，because of the impact of the COVID-19 epidemic，more users gather to online platforms，micro-documentaries become one of the mainstream contents of Internet documentaries，and fusion media communication becomes the main communication force. This paper compares and analyzes four aspects of Chinese online documentaries in 2020：industry data interpretation，content types，platform strategies，and typical popular news，in order to present a more comprehensive analytical overview of typical hot online documentaries.