In allusion to the effect of the vibration isolation on frequency response characteristic of the photoelectric tracking system, a study has been carried out to discover variation laws of the frequency response characteristic, starting with analysis of the dynamics model of the photoelectric tracking system with the vibration isolation device. Two ideas to suppress adverse effects of the vibration isolation device are presented. One is to modify the design of mechanical structure of the vibration isolation device so as to improve resonance characteristic of the base’s angular motion; the other is to adjust the control strategy of the azimuth axis in order to eliminate negative effects on the tracking control due to swaying of the base. The latter is studied intensively. During the research, the angular position and angular velocity of the base as well as the photoelectric system are measured and the obtained information is used as state variables, which are utilized in the state feedback pole assignment method to remove all resonance poles of the speed response section and cancel the resonance zeros. It is demonstrated in the simulation result that when the state feedback pole assignment method was applied to a photoelectric tracking system installed on the vibration isolation device, with stability as the premise, the amplitude in steady oscillation condition was reduced to 7×10-6 rad from 2.4×10-4 rad. It is concluded that the state feedback method applied to configure the closed-loop desired poles of the speed response section can efficiently suppress adverse effects of the vibration isolation device on the system.