In steel frame-reinforced concrete corewall structures, concrete shrinkage and creep directly affect the shortening of corewalls and then influence the shortening of columns through beams, and have a significant impact on the vertical differential shortening. Controlled by time parameter, the displacement method recurrence equation, which takes into account the construction procedure and the concrete shrinkage and creep effect, was used to provide numerical computation for the above problem. The studies show that the long-term concrete shrinkage and creep have great effect on the vertical differential shortening, and that the decreased environment humidity enhances these effects. When considering the concrete shrinkage and creep up to 3 years after the completion of the main structure, the cumulative shortening of concrete corewalls exceeds that of steel columns in top storeys. The axial compressive forces of columns usually increase by more than 10%, and the axial compressive forces of corewalls in top storeys become tensional. The bending directions of some beams reverse to affect beam design.