The basic, professional basic and professional courses are offered for postgraduate students in HVAC in Harbin Institute of Technology. The diversified assessment methods are put forward in accordance with the characteristics of different types of courses. Besides process management is enhanced in teaching process. The curriculum assessment contains various ways, such as "final examination + course paper + report defense", "final examination + reading assessment + review paper + case paper + questions + discussion", "final examination + research report + plus score", "on-line practice + research report", course paper + course practice + case defense". The diversified assessment methods discussed in this paper have been applied to teaching reform of HVAC discipline. It can certainly provide a reference for the postgraduate courses assessment reform of other engineering field.