Business efficiency is based on scope. Different enterprises have different optimal scope and its own way of fulfilling it. This essay deals with the following: To achieve optimal efficiency, how an enterprise handles its overmuch resources under the optimal scope; the pure scope expansion; the scope expansion when the relationship between price and output appears linear. The essay concludes the following: when the enterprise has the preliminary optimal scope and doesn't own overmuch resources, the pure scope expansion as the way of the resources and enlargement is the best; when the relationship between price and output appears linear, the enterprise can achieve optimal expansion coefficient and greatest optimal scope.