Abstract：

Describes the status of HVAC scheme design and analyses the problems in scheme design stage. Concludes that scheme design stage is the most important, complicated and difficult stage in HVAC design progresses. There exist many problems in this stage which are often overlooked mainly for reasons of the problems in administration system for architecture design and lack of a scientific and objective assessment method. Points out the opinion that a life cycle assessment should be applied to the comprehensive evaluation and selection of an HVAC design scheme, combined with the consideration for the technological, economical, environmental and humanistic factors.