Relying on its mature and complete power consumption information collection system, and in collaboration with other energy service enterprises, State Grid Corporation of China has carried out research and verification of “water, gas, and heat” multi meter integrated information collection technology in multiple provinces and cities across the country in recent years. Due to the fact that the “water, gas, and heat” multi meter integrated reading system requires a large amount of data interaction with external systems through various interfaces, as well as data interaction with water, gas, and heat companies through Internet VPN channels, there is a risk of data leakage caused by external systems illegally intruding into the company’s internal systems through the Internet. To this end, with reference to the relevant regulations on information security protection of relevant business systems of the State Grid Corporation of China, the overall security protection architecture and specific security protection measures at various levels of the multi-meter integrated system are designed to maximize the security of relevant data of the multi-meter integrated reading system and the stable and reliable operation of the system.