Abstarct: Bearing wall structural systems are one of the prevailing structural systems in many parts of the word. These structures performed well in past earthquakes. This encourage extensive use of these systems in region with high eathquak risk. According to lack of information about how these systems perform against seismic loads, specially those systems with high ductility, recognizing system’s treatments have special importance. So in this thesis effect of height increasing on seismic behavior of reinforced concrete bearing wall structural systems with high ductility, in order to identify weaknesses and strengths of those, have been studied. For achieving this goal, buildings with Bearing wall systems in 4,8,12,16 and 20 stories, according to rules of regulations ACI318-99 and Standard No.2800-05, 3rd Edition of Iran and using ETABS software, are designed. After 3D modeling in PERFORM 3D software, Nonlinear Static analysis, according to the guidelines of FEMA 273, is made. baxsed on the guidelines of ATC 19, seismic parameters such as Behavior factors, period, Ductility ratio, Strength factor, Ductility factor are computed. Then effect of some factors such as height, gravitational loading pattern and lateral loading on these parameters, are studied. The results show that Behavior factor is very sensitive to height variation, and according to retained values for Behavior factor, design codes coud not provide marginal of security. Also Torsion is an exceptionally important criteria appearing in the dynamic mode of those structures that shoud be taken in to account for the design.