The invention provides a rolling parameter optimizing method with steady rolling being the target under (double cold-reduced) DCR unit large deformation. The rolling parameter optimizing method mainlycomprises the following steps executed by a computer that (1), main equipment and process parameters are collected; (2), the parameters and intermediate process quantity are defined; (3), k1 is initialized to be equal to zero; (4), front tension sigma 1 is calculated; (5), k0 is initialized to be equal to zero; (6), rear tension sigma 0 is calculated; (7), a friction coefficient Mu is calculated;(8), lower rolling pressure P and the front slip value S are calculated; (9), a control target function G1 (X) is calculated; (10), whether an inequation is true or not is judged; (12), the optimal unit front tension sigma 1y and the optimal unit rear tension sigma 0y are output. By means of the rolling parameter optimizing method, the probability of instability of steel strip rolling is loweredto the maximum degree, and better technical guaranteed is provided for steel strip quality and overall rolling stability under the situation of double cold-reduced unit large-deformation rolling.