The input voltage of the MR damper could be gotten directly by the response of the system, when the fuzzy semi-active control method was used for the vibration control of the cable-stayed bridge. An improved fuzzy semi-active control method, for parametric vibration of the cable-stayed with MR damper, was proposed, to make the fuzzy semi-active control method more smart. The parameter vibration control of the cable M22 and the cable M13 of the Hongshuihe cable-stayed Bridge was studied. The results show that the effect of the improved fuzzy semi-active control strategy is better than that of the fuzzy semi-active control strategy. In addition, the proposed fuzzy semi-active control strategy does not need to debug the scaling factor of input variables and output variables, and the MR damper requires lower voltages. Therefore，the proposed method makes the fuzzy control more intelligent.