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In this study we suppose that knowledge management system is a facility for developing knowledge in a company; this system effects the correlation between intellectual capital and business performance. Thus in this research we studied effect of knowledge management on business performance as a moderate variable. Therefore we attempt to explain relationship between intellectual capital and business performance regarding knowledge management. It was found that the knowledge management system moderates the relationship between intellectual capital and business performance. Also we found a positive correlation between three dimension of intellectual capital and business performance. Despite a positive correlation between intellectual capital and business performance, when we controlled the effect of knowledge management we observed that the correlation was less than before. This indicates significant effect of knowledge management on intellectual capital and business performance. It is observed by correlation analysis that KM as a moderated variable, has a positive effect on the business performance and we show that the relationship between IC and BP is positively moderated by KM.