The BIM-based HVAC software is an inevitable result of the combination of computer technology and HVAC technologies. It is a chance of great improvement of the level of HVAC software. For the HVAC software development engineers, it is a challenge as well as a chance from scatters to integration and from a closed system to an open system. For LC of buildings, the unique characteristics and data share within and between professions to effectively use the professional models are concentrated. Based on the development and requirements of new HVAC design software, the research on how to use BIM technology are discussed.