The purpose of the study is to investigates the mediating role of supply chain performance on the relationship between customer and supplier relationship management and information sharing on firm performance Alfamart under Sumber Alfaria Trijaya Ltd, Indonesia. The study involved 168 West Java area coordinators of the company supply chain department and used SEM analysis technique with help AMOS software. The findings show that the customer and the supplier relationship management influence supply chain management performance. Then, the supply chain management performance influences firm performance. But there is not impact the information sharing on supply chain management performance directly or on firm performance indirectly. The supply chain management performance is confirmed, mediates the relationship between the customer and supplier relationship management and firm performance. The study's original is when the central office conducts information sharing with a supplier, so the branches cannot access the information. Therefore, in this case, the information sharing will not directly influence both the SCM performance nor the firm performance.