Today, construction is a complex and risky industry, and the progress, development and prosperity of countries depend on the creation and implementation of development projects that are a manifestation of this strategic industry. These projects are complex, costly and time consuming, and due to the large number of people involved in projects and multiple stakeholders, we see claims and disputes during the implementation of projects and these claims and disputes have a detrimental effect on projects and predetermined goals. In such a tense environment which is full of uncertainty, it is necessary to pay attention to knowledge and management of intellectual capital as a way to overcome the differences and challenges in projects and gain a sustainable competitive advantage. Therefore, the present study was conducted to investigate the effect of knowledge management on claim management. The present study is applied in terms of purpose and descriptive and correlational in terms of data collection method. The statistical population of the present study is the members of Fars Province Engineering System Organization. The sampling method was random and available and the sample size was determined by Cochran's formula to 369 people. Data were also collected through standard questionnaires. To assess the validity, content validity and reliability of the questionnaire from Cronbach's alpha were used. To test the hypotheses, linear regression test was used using SPSS software. The results of the hypotheses showed that there is a significant effect between knowledge management and claim management.