Based upon the dual theorem of linear programming, two respects about supply-sale location of mass goods and materials-relative price system correlated with the optimum location and relative locational superiority of supply or cosumer places are discussed. The dual problem is explained in geographical interpretation. The authors think that the model may be extended to allocate the various resources. Jt is used to study the theory of economic geography, as well as to direct productive practice. In this paper, the authors presented a case study.