Risk management is a new branch of management science that, despite being young, is rapidly expanding and growing and has been welcomed by experts and managers in a variety of trends and in a wide range of subjects such as investment, business, Insurance, safety, health, industrial and development projects and even political, social and military issues have found their place. Therefore, it can be concluded that risk management has a special place in project management and has commonalities with it, including commonalities can be the uniqueness of the project, uncertainty in the hypotheses, goals and requirements of the project and … Enumerated. In general, the environmental factors governing the project are the roots of uncertainty and the source of risk in projects. Issues such as uncertainty in the basics and initial estimates of the project, uncertainty in the design and procurement of the project and uncertainty in its objectives, make the conditions of the projects very risky and make risk management in the projects unavoidable. Therefore, in this article, first the concepts of risk management in construction projects are examined in general and then risk management with a knowledge-based approach and also its relationship with value management is examined. Finally, a case study of risk management in construction projects with a view to finding the sources of risk is reviewed. Finally, suggestions for further study and research in this field are provided.