The main purpose of this research is to study the electrical consumption of total 18 airports in Taiwan. The study also takes the northern boarding corridor of Terminal No. 2 of Taoyuan International Airport as an example for simulation analysis in order to understand the efficiency of energy saving on airport facilities in Taiwan. Based on varied energy saving measures, the electrical consumption on lighting system, air condition and other M&E facilities are calculated in order to find out the most influenced factor on energy saving. The average value of electrical consumption in airport facilities in Taiwan is 276 kWh/m2 based on the study. It is recommended that the index of energy consumption in Taiwan’s airport facilities should be divided into five levels (222 kWh/m2 – 402 kWh/m2) according to actual operation condition. Energy saving measures adopted in this simulation analysis include: reducing the density of lighting system increasing the efficiency of water chiller unit various water volume (VWV) various air volume (VAV) ventilation economic Based on the analyzing results, the most effective energy saving measure is to adopt ASHRAE Standard for lighting system. The overall yearly electrical consumption can be reduced up to 15.46% including 7.0% contributed on air condition system and 51% from lighting facilities. The other energy saving measures ranked according to it’s energy saving efficiency are ventilation economic, various air volume (VAV), increasing the efficiency of water chiller unit and various water volume (VWV). The result of this research can provide the reference of energy-consumption index for airport terminal, to evaluate reduction of energy consumption. It also is a good planning and design reference for the future Terminal in Taoyuan airport or other airport terminal project.