In the paper, the seismic responses of adjacent-structure-system connected with friction damper were studied and the parameters influence was analyzed. Two numerical models, ideal bilinear model and Bouc-Wen hysteretic model of friction dampers are proposed for adjacent structure. It''s found that the proposed two numerical models are accorded with each other perfectly. The maximal displacement and acceleration of top floor of the sub-structure, the total energy dissipation of system and the ratio of damper energy dissipation wre proposed as targets of control effect. Then the seismic responses of adjacent single-degree-of-freedom structures and multi-degree-of-freedom structures connected with friction dampers wre studied and the parameter influence was analyzed. The results indicate that the value of friction damper parameter will affect the seismic suppressive effectiveness evidently and the seismic responses of sub-structures can be controlled availably to acquire notable seismic suppressive effectiveness when the system is designed becomingly.