The engineering construction project has the characteristics of huge amount of investment, long construction cycle and many risk factors. In the process of planning, construction and operation, they are affected and restricted by many factors, and the consequences of risks are relatively serious. Taking H welding workshop construction project as an example, this paper makes an in-depth analysis of the risk influencing factors of the engineering construction project, and comprehensively uses the hierarchical analysis method and fuzzy evaluation method to make a more scientific and in-depth analysis of the risk of the project. After practical application verification, this method overcomes the difficulty of the risk assessment index of complex and difficult to quantitative evaluation of engineering construction projects, and provides a new method for the scientific management of engineering construction projects.