The division of Yantai's first-class platform and second-class platform is mainly based on the function and service scope of the platform. The first-level platform is usually a government department or an organization authorized by the government, which is responsible for the information planning and construction of the whole region and provides services such as infrastructure, data resources and security. On the basis of the first platform, the secondary platform provides specific business applications and services according to the needs of different departments and fields. For example, information application platforms in medical care, education, transportation, environmental protection, public security and other fields all belong to the category of secondary platforms.