In order to improve competitive power of construction enterprises the method of multi-level fuzzy comprehensive evaluation is adopted to build a fuzzy comprehensive assessment model,the model of value chain management and its optimization are investigated.Then all elements of value chain core competencies have been separated to build the assessment system to evaluate the value chain core competencies of construction enterprises.Results of the research indicate that the intensity of value chain core competencies and the influence of all elements can be calculated by the assessment model.