Abstract: Human reliability analysis (HRA), as an important element of probability safety assessment (PSA) of nuclear power plant, has always been the key content that affects the quality and risk insight of PSA. Up to now, there are many HRA methods and each method has its disadvantages, and the HRA database is always too old. So a new HRA method which called IDHEAS (integrated human event analysis system) method was developed by the U.S. NRC. The IDHEAS method was studied systematically and the case analysis was carried out in the paper. Theoretical research and case analysis results indicate that IDHEAS method is feasible for engineering project and it can solve the limits of other HRA methods. At the same time, IDHEAS method is insensitive to time parameters and some contents of this method depend on the experience of the analyst.