Abstract: A real-time simulator of Automatic Gauge Control (AGC) for hot-rolling mill based on Digital Signal Processor (DSP) was proposed. The models of the hydraulic cylinder for Automatic Position Control (APC) and the deformation area of each stand were built. The simulator was performed by using parallel processing based on dynamic simulation of the characteristic of the strip and the stands which were coupled by the rolled material, and exchange data with the AGC controller of a computer control system through reflective memory network in a real-time mode. It could be used for developing and real-time testing AGC control strategies in off-line state. When simulated, the dynamic models were executed by a digital signal processing card and exchange data with the AGC controller in a real-time mode.