Abstract: With the gradual maturity of the financial market, many kinds of finan cial technologies have been developed at full speed. Many financial tools have b een applied not only in financial market, but also in other fields. This paper g oes from the prospective of finance and uses swap, a basic financial derivative tool, to give a new method to the stock management in an enterprise. During the research,we found that all the former methods go from the prospective of cost a nd try to give a minimized management method. But they ignore the risk of the st ock, especially the price risk in the market. But this one has been a very impor tant factor of the stability in operation of an enterprise.