The complexity of the goal and the diversity of factors determine that the green building is a complex system. However, previous studies were mainly aimed at single structure of a green building. Therefore, a systematic research on green buildings is necessary to carry out based on a whole green building system. In order to realize all benefit requirements of the green buildings, the theory of complexity science and system science analysis, and methods of various technical measures are adopted to study the mutual relations of project goals and the influencing factors. From the perspective of system research, this paper built a green building technology system model, decomposed and combined a series of theories and technology adopted in green buildings, which formed a green building design under the restriction of independent structures, different targets, and functional integration technology module systems