Abstract: Structural collapse is the main reason of earthquake disaster, and the rational assessment of the lateral incremental collapse resistant ability of a structure is not only a prerequisite for the design, but also is the basis for the identification of seismic performance and for the strengthening of an existing structure. In this paper, the seismic performance factors are used to quantify sidesway collapse resistant capacity of codified designed structures. A structural failure mode is used to identify the process of collapse, the system overstrength factor, the ductility factor, the ductility reduction factor, the response modification coefficient and the deflection amplification factor are all obtained, and the effects of the distribution of lateral loadings, beam-column’s linear stiffness ratio and column overdesign factor (COF) are considered in the analysis. It is demonstrated that based on seismic performance factors, we can quantitatively assess the sidesway collapse resistant capacity of the structure, and realize dual control of structural ductility and capacity.