Restoration is an important part of architecturalhistory studies. There are several different systems for architectural reconstructions — experimental archaeology and computer technology, the goal to reconstruct the building appearance is the same. There are few towards reconstruction constructions. Through direct observations, this paper analyzes materials, structures, and techniques to interpret the Huangchengtai Gate and trace its history. The construction issues are the center of this research. An estimation of the working days to construct the Huangchengtai Gate is made according to the Yingzao fashi, which summarized historic data and set out standard manpower for construction work in the Song dynasty.