Energy saving concern and carbon emission reduction draws global attention earnestly during the last decade. Codes and standards for energy saving are applied to regulate carbon emission reduction accordingly. Energy use intensity (EUI) is commonly adopted to evaluate the energy consumption intensities. However, little quantitative data were available especially for a long term monitoring and analyzing on hotel building served with different and complex functions such as restaurants, reception, ball rooms and guest rooms. This study investigates the energy consumption and a weighted EUI of a hotel building in Taiwan through comparison of energy modeling data and field measurement data. Public areas and guest room areas were separated individually at each floor to conduct energy modeling analysis. Energy modeling code (EnergyPlus) was applied to predict the annual energy consumption of this hotel building. The results reveal good agreement between energy modeling and field measurement data which can be acquired from building energy management system (BEMS) data for one year. The ambient temperature and occupancy rate of this hotel building affects the energy consumption significantly. EUI of this building was developed accordingly in the year of 2013-2014. It reveals the EUI of this hotel building can be reduced satisfactorily from 203 to 152 kWh/m²-year (5.93x10⁴ to 4.82x10⁴ Btu/ft²-year) after implementation of energy-saving strategies.