This paper proposes the advanced stage after industrial

Internet interconnection:Enterprise-AI Agent（EAI）.It is totally different from intelligent enterprises in attributes

history

relationships

evolution

statistics

centralized control

etc.The definition of EAI

"Why should we build EAI"

"What are the characteristics of EAI"

"How to construct at this stage"

"What is the engineering science and technology of EAI"are given in detail.Among them

this paper emphasizes that an EAI should build two related factories:intelligent and physical（perception part）."Physical factory+ Enterprise Cloud Network+equipment+sensing+big data+algorithm+artificial intelligence"is the basic element.EAI will greatly break through the limitations of traditional enterprises’ capabilities

informational power

space and time.It will reshape enterprise development mode and enterprise organizational structure

and improve the accuracy

efficiency and predictability of enterprise management.