With the development of three dimensional (3D) technologies, mapping cities based on digital information and constructing city landscapes has become increasingly close to people's life. Many domestic and foreign institutions are doing research on the digitalization of cultural relics. In the past, only single cultural relics could be reconstructed with the 3D technique. Time and funding was needed to collect surface texture information and to build the model. Therefore, the technique could not be applied to large scale models and could not be used for a 3D scene construction of cultural relics. True three-dimensional construction of major cultural relics is the key to the construction of three-dimensional cultural landscapes. But large artifacts usually have complex structures, with large amounts of measured data, therefore are rather complicated in terms of texture mapping and organization of results. For these reasons, this paper proposes a fast mapping method based on 3D laser scanning polygon, and uses the reconstruction of the Buddha sculpture in Dafosi (great Buddha temple) of Bin County as an example. Feasible schemes are discussed for making maps of large relics in order to achieve real 3D models of large artifacts. This experiment provides a new way of thinking and a technical method for construction of real scene artifacts using true 3D modeling.