Life cycle assessment (LCA) of a building is a new methodology which accepted as one of the best ways to estimate the environment impacts of a building during its life. In this paper, LCA analysis on a primary school wooden dormitory was conducted using Athena software firstly. Then two others construction materials, namely, concrete and brick, were assumed to be adopted to construct the dormitory. Also the LCA analysis was conducted on the two dormitories using concrete and brick. The comparison on LCA results of the three buildings using different construction materials showed that the dormitory constructed by wood is relatively greener than that of dormitory constructed by concrete and brick.