Commissioning of the HVAC system has been practiced in buildings for the purpose of energy conservation and performance optimization. Commissioning of the HVAC automation system should be paid more attention. In this paper, Objective Control Method (OCM) is proposed to analyze the operational performance of VAV control system. The approach starts with the evaluation of satisfaction of indoor thermal comfort, and then is followed by the performance analysis of different control loops with a graphic chart of relations between different parameters. Finally the operation fault is detected. This approach has been applied and validated in a real VAV control system of a commercial office building in Beijing with one year's on-site measured data. By means of OCM, phenomena of 'hunting' in VAV control system are deeply studied. As a new commissioning approach of VAV control system, OCM is of great feasibility and convenience.
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