This Article mainly focuses to the relationship between capacity and value. Recent Developments on Management Accounting rely on the theory of Value Chain heavily. For instance, supply chain management and customer relation management are from same origin. M. E. Porter insists that realization ofcompetitive advantage pay much more attention to strategic position inside specific industry; however, concrete measurements for profitable zoning are still vague. On the other side, traditional cost measurements keep to be fine tuned for tracking path on resource consumption. As one of such critical areas, capacity theory is more supportive for the analysis. Capacity theory has some theoretical features for the integration resource consumption and value creation. Restructuring of management accounting demands rational measurement methods on costs and value. This introduction to capacity theory might provide a handhold for remaking Legacy System.