The investment in ecology environment is a hot spot at present. Firstly, taking project L as its background and using the hypothesis of economical mankind, this article analyzes that there exists a contradiction between different subjects in the requirements for the functions of project, which makes it hard to embody the theme -"the harmony between human beings and nature". Then with the techniques of building models, the author tries to unfold the theme according to different function requirements and resolves it into each sub-project concretely. Through disintegrating reasonably and conformity organically the overall construction function, the function model resolves the above - mentioned contradiction and makes the whole project embody the theme.