Aggregate planning is an important method in supply chain management to increase competition and customer services in the market. Supply chain management information systems are the information systems between companies that employ information and communication technology to arrange information inside and among the participator of a supply chain such as clients, sellers, providers, and distributors. The goal of this research is to designing and developing an information system, for implementing aggregate planning methodology; to make decision about production, outsourcing, inventory, and backlogs in supply chain. This research presents a method for implementing aggregate planning throughout information system which contributed to reduction in costs. The model can combine optimal baseline inventory level, production planning, and distribution planning together in an aggregate planning in order to overcome the shortcomings and constraints of the classical linear programming model.