The hallmarks of todayís business environment are volatile demand, shorter product life cycles, and increasing global competition. Advances in information technology allow more and more information to be shared across entities so that the activities can be better coordinated throughout the entire supply chain. For different products and under different demand patterns, sharing information may have quite different results. Our research aims to study the relationship between product nature, demand pattern,and information sharing strategy. As product nature changes at different stages in the production cycle, and over time, demand pattern changes accordingly, thus requiring changes in information sharing strategies employed. We use the multi- agent simulation system to evaluate the effectiveness of the information sharing strategies under different product natures and demand patterns.