Abstract: Because of the variation of strip steel gage along its length during the Flying Gage Change (FGC) process of a tandem cold-rolling mill, it is unsuitable to apply the routine formula into its tension calculation. As to the question, a new tension calculation model of wedged strip steel was proposed and generalized into the strip steel with any shape. A discrete model was deduced using the numerical computation method in order to apply the model into control and simulation during the FGC process.