IN THIS PAPER, WE OBTAIN A State FEEDBACK MATRIX BY ELEMENTARY SIMILARITY OPERATIONS SUCH THAT THE EIGENVALUES OF THE CLOSE-LOOP SYSTEM LIE IN THE SELF-CONJUGATE EIGENVALUE SPECTRUM AND FOR REJECTED DISTURBANCE A ARBITRARY SYSTEM CONTROLLABLE WITHOUT DISTURBANCE IS CONSIDERED, THEN WITH USE AUGMENTED MATRIX, THE Two SYSTEMS MERGED IN A NEW SYSTEM WITHOUT DISTURBANCE, BY TRANSFORMATIONS SIMILARITY COMPUTE OPTIMAL Controller, SO THAT DISTURBANCE HAS NO EFFECT ON THE SYSTEM. SINCE, RELATION BETWEEN THE PARAMETERS OF State FEEDBACK MATRIX IS NONLINEAR IN GENERAL THEREFORE, MANY DIFFERENT CONSTRAINT MAY BE IMPOSED BY THE DESIGNER TO OBTAIN DESIRED PERFORMANCE CRITERIA. A ILLUSTRATIVE EXAMPLE IS PRESENTED.