The steady state gains of variables of the process which has recycle streams(most of all chemical processes)are different from those of each individual process. If the gains of individual process are applied to the criterion for the steady state gains, it is wrong to pair the control loops and analyze the interaction of variables of process with recycle. In the end the resonable selection of control structure is mistaken. The proper calculation method of steady state gains of process which has recycle streams was proposed through the efficient sensitivity analysis of process flowsheet variables. The treated recycle processes were divided into two cases. In the first case, independent variables(input variables)only exist in the interesting unit and in the second case, independent variables exit several units at the same time. The method was suggested to calculate correctly the steady state gains for the each case. The suggested method was applied to example to illustrate its usefulness.