Knowledge is a strategic organizational resource and a justified and correct belief that is a combination of experience, values, contextual information and insight from experience. Also, in today's competitive world, organizations are looking for ways to maintain their superiority in the market. In competitive environments and in line with the intensification of competition in industries, organizations need abilities, capabilities and competencies that distinguish them from other competitors in order to survive and gain profit. This research aims to investigate the effect of knowledge sharing on sustainable competitive advantage with the mediating role of potential and actual knowledge absorption capacities and imitation and innovation strategies in knowledge-based companies located in Pardis Science and Technology Park, Tehran Province. The research is descriptive-survey in terms of its applied purpose and in terms of the nature and method of data collection. The statistical population is 136 companies located in Pardis Science and Technology Park, Tehran Province, of which 100 companies were selected using the Cochran formula and simple random sampling method. In order to collect data, a researcher-made questionnaire was used and the results of the research were analyzed using statistical software at two levels of descriptive and inferential statistics. The results of the research show that knowledge sharing is effective on sustainable competitive advantage with the mediating role of potential and actual knowledge absorption capacities and imitation and innovation strategies in knowledge-based companies in Pardis Science and Technology Park, Tehran Province