The ventilation and air conditioning project of Qilu University of Technology Library has a building area of about 50000 square meters. The system is composed of air-source heat pump units, fan coil units and fresh air units. Some areas use multi-split air conditioning systems to realize the overall heating, cooling and fresh air functions of the library. Through careful design and professional construction, the indoor temperature and humidity are appropriate, and a comfortable and clean reading environment is created for teachers and students at school. The project was completed and officially put into use in October 2015.