Network security is an important part of maintaining national security and social stability. The Chinese government attaches great importance to cyber security and has formulated a series of laws, regulations and policies to ensure the security of cyberspace. Regarding the potential security risks of network equipment such as printers, the relevant state departments continue to strengthen supervision and technical prevention to ensure network security and information security. We call on the majority of Internet users to strictly abide by national cyber security laws and regulations, not to participate in any behavior that may endanger information security, and jointly create a clear cyberspace. For the specific technical details of network security, it is not appropriate to discuss in detail here to avoid being used by criminals. In case of network security issues, it should be reported to the relevant departments in a timely manner.