n this paper,A new reverse dynamic modifying method of structure isintruduced to medify voriables,in conditions of dynamic binding goals which are gived. As thestructure frequency and the dynam ic rephonses were binding goals,we computed the structu re,it isclear that in this methed,the conditions of modified binding variables must small is relcased.we haveattained a satisfied result in applying in dynamic controls of frame of auto mobiles.