Abstract: This paper describes the simulation of cold tandem rolling process by digital computer using the dynamic state mathematical model of cold tandem rolling discussed in [1], and gives the result and analysis of the simulation. The features of this method are: the tension model is, expressed as the state equation in the form of difference equation, which can be conveniently solved by recursive method; the tension system and the thickness system are seperable, so that the thickness equation becomes one dimensional nonlinear one after having solved simultaneously the tension of each stand and by means of the secant method, it is convenient to solve the outgoing thickness of each stand. Thus the trouble of computing the partial derivatives caused by the linearization of the model and the limitation of application only to small disturbances can be avoided. This method effectively decreases the amount of computation and possesses higher degree of accuracy than that of using linearized model.