Cable-stayed structures are rational and beautiful.But cables are susceptible to vibration with large amplitude caused by special load.Then Structures will become more unsafe.Control of cables vibration is realized through linear quadratic optimal control strategy.Parametric analysis of vibration control system for flexible taut cables is conducted.The influences on vibration control are discussed due to the changes of weighted parameters.Discrimination criterion of optimal active control force and iterative computing method are given for improving design efficiency of the controller.