Today, our country is experiencing the rapid development of economy, with a growing dependence on energy is the energy shortage problem. But our country is in a peak pe-riod of construction, building energy consumption accounts for nearly 30% of the amount of energy consumption. This paper constructed index system of building energy saving, establishing the decision-making model based on Grey Relevancy and Ana-lytical hierarchy Process. Combining with engineering example, comprehensive score of energy-saving buildings is made and an effective method that can choose the high quality energy-savi...