The Information Economics and its platform can input the vigor into manufacturing industry, i.e. garment industry, and help to increase its ability for good return, can promote the level of technology and management of Garments from a labor-intensive industry, and can move it toward the accurate management. The platform is designed as Comprehensive Information Platform by our research team. This paper is one of the series of papers about the design of Agile Infrastructure for Collaborative Manufacturing as well as Agile Supply Chain. This one lays emphasis upon the design of the decision support system for supply chain. We mainly concern and research into the design of decision support system for the production planning and interval inventory management. In production planning decision support, the author researches into the production planning model based on the multiple product requirements, promotes the algorithm about output risk decision of the Hopfield Neural Network based on the model of output risk decision and the Agent theory, and provides a new way of thinking to the solution of the algorithm about risk decision. The solving algorithm of Nash equilibrium point searching for the interval inventory management decision support is based on the Game Playing model of supply and requirement in the two-level Supply Chain as well as MAS theory. The paper tries to introduce the research of Agile Infrastructure and its key technologies, showing how well they work in some traditional manual industries.