The paper presents construction performance comparison of curtain wall operations. It is well known that curtain wall operations are major parts of high-rise construction projects. Literature reviews of high-rise buildings and curtain wall operations lead the study to focus on a unit system which has been widely applied in the domestic high-rise curtain wall construction. Data was collected by recording in actual curtain wall construction sites and simulation model was implemented for the quantitative comparison between the simulation value and the value of actual curtain wall construction sites. It is expected that this proposed study contributes to the further studies of developing an optimized assembling process model for engineers and site personnel in construction.