Abstract: Against there is no design specification for reinforced concrete (RC) columns with Z-shaped cross-section in the technical regulation of structure w it h special shaped columns, the bearing capacity and ductility of RC Z-shaped cro s s-section were computed by utilizing the nonlinear analysis of RC cross-sectio ns subjected to biaxial bending and compression and its computer program. Some fact ors affecting the bearing capacity and ductility of RC Z-shaped cross-section, were researched, for example ratio of axial compression, loading angle, reinfor ced ratio, concrete strength and ratio of limb length to limb thickness, and some c urves of the bearing capacity and ductility were drawn. Some favorable results were obtained: the bearing capacity is mainly affected by ratio of axial compres sio n, loading angle, concrete strength, long reinforced ratio and ratio of limb len gth to limb thickness mainly affect, and hoop reinforcement has little affect. r atio of axial compression is the most important affect factor for the ductility, but there is a little affect for the ductility from ratio of limb length to lim b thickness.