This paper presents an integrated system in which a computer-based decision support system (DSS) for construction project risks assessment at stage of contracting and construction. The Analytic Hierarchy Process (AHP) method is used to determine the weightings of risk factors from subjective judgment of experts and practitioners, and Fuzzy Multiple Criteria Decision Making (FMCDM) is used to assess the synthetic judgment of risk degree for the main activities of a construction project in different phase. A simple case study illustrates the effectiveness of the proposed approach and developed system