The invention discloses a lightweight man-machine interactive system of a regulation and control system, comprising regulation and control system man-machine servers used for providing various services required by interface displaying for lightweight man-machine terminals; and the lightweight man-machine terminals which are divided into B/S mode man-machine terminals and C/S mode man-machine terminals according to scheduling production regions to which the lightweight man-machine terminals belong and receive displaying contents from the regulation and control system man-machine servers and display the displaying contents; wherein each regulation and control system man-machine server comprises a basic platform service layer, a man-machine service layer and a protocol interface layer, the man-machine service layer is used for providing a middle display file for the lightweight man-machine terminal, the protocol interface layer is used for packaging services of the man-machine service layer and outwards providing a service calling interface having the same function for different protocols; and each lightweight man-machine terminal comprises an interface description layer and a displaying realization layer. The lightweight man-machine interactive system of the invention has the beneficial effects that: resource occupancy of a man-machine client in the regulation and control systemis reduced, multi-terminal unified displaying is supported, and same browsing between a local area and a nonlocal area is achieved.