From ancient times to the present, any behavior is inseparable from the word information. Information can influence and determine a person, a religious custom, or even a country's behavior, thoughts, and even destiny to a great extent. In this age where media is everywhere and information is flowing, people have to accept a huge amount of information every day. People are often influenced by a single information source and recommendation algorithm, and can only see the information they want to see, which makes their thinking more and more closed. And when some people begin to realize it and start looking for other sources of information, they will be overwhelmed by overwhelming and completely opposite information. So how to distinguish the authenticity of information? Is there someone who can control the spread of information and create an information cocoon for others? And when people are looking for the "truth", are they just entering another information cocoon? Tolstoy said that every writer is only writing his own one-sided knowledge. Information cocoons not only exist in online media, but also exist around people in countless forms.