The construction of large-scale three-dimension city models faces the problem that the data is too huge, the mission is
too heavy, and the development cycle is too long. Facing so many types of buildings and other city objects, it is very
difficult to finish the Construction of 3D city models quickly and efficiently using only one technical method. How to
operate the construction of large-scale 3D city model based on multi-source data quickly and efficiently is a hot issue in
current researches. This paper proposes the method of constructing large-scale urban three-dimension landscape and
creating virtual reality by using Skyline, a powerful software of 3DGIS, which is based on two source data, RS image
and DWG. It also gives a detailed illustration on the key problems related to the construction during the course of
construction, such as modeling of the particular object, texture projection, etc.