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