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Most researchers focus on the step of data mining, or data cleaning and integration, or data selection. However, there is a gap from the data mining to its real world application. In this paper, a step between data mining and application called the second data mining or knowledge presentation and management is proposed. The second data mining is the key whether the data mining result benefits the manager, especially in finance and business field. Four cases are proposed in this paper, and the distance between the data mining result and the real application in its field are analyzed. In the meantime, the importance of second data mining is shown at the end of the paper.