A Kelvin-Voigt type passive control unit was set up between the equivalent two-body single-degree-of-freedom simplified models of adjacent isolated structures. Based on the Kanai-Tajimi spectral stochastic seismic motion model, by taking the minimum of the total vibration energy of the structures as the optimal control objective, the influence rules of the connection control parameters on the control effect have been drawn on basis of detailed analyses, as well as the optimal control parameters. According to the equivalent two-body single-degree-of-freedom model, the optimal parameters of connection control between adjacent high-rise isolated structures were obtained; The response expressions of adjacent high-rise isolated structures were derived from the time domain and frequency domain; The influences of connection control devices on the natural vibration characteristics and random responses of the structures under different layout schemes were analyzed. Finally, it is proved by numerical analysis that, this control method can be applied to adjacent isolated structures, which has control effect on each structure. It shows that the control method is effective for the adjacent isolated structures.