Abstarct: Coupled steel shear walls which are developed form of the conventional steel shear walls are one of the best seismic systems with high performance that have been used in recent years for designing of high structures in many earthquake-prone countries like Japan, Canada and America. The system of coupled steel shear walls is consist of two or several seperated steel shear wall that have been connected to each other by strong steel beams at the alignment place of ceilings on each floor and these beams are called lixnk beams. In this research, parametric effectiveness of lixnk beam have been investigated by Abacus software, then the role of lixnk beam in ductility, energy absorbing, ultimate strength and stiffness of lixnk beam and also effectiveness of lixnk beam’s shape and geometric properties for improvement of lateral bearing capacity have been investigated. Results show that using tapered lixnk beam show appropriate seismic performance and cause to increasing ductility, energy absorbing, ultimate strength and stiffness of the system and also for a coupled steel shear wall system with constant lixnk beam’s cross section, length changes of the side span has significant effect on ductility, strength, stiffness and energy absorbing. Results show that using lixnk beam with I cross section, plate and equivalent tapered plate in comparing to other equivalent cross sections is more ductile and more stiffness and show very high energy absorbing and with increasing of lixnk beam’s dimensions, energy absorbing, stiffness, strength and ductility under uniform loading will increase.