Abstract: In recent years many enterprises already have implemented the ERP system, and can apply in the enterprise, already formed accurately, prompt, the integrity management decision-making foundation data. How use these information data, participate in decision-making, realize decision-making support has become current and the next ERP development tendency and ultimate objective. Based on the present situation, the author uses one kind of brand-new mentality. It make data mining technology applies to the decision support system , causes the quantitative analysis and the qualitative analysis unifies ,introduce Spreadsheet method of management science that carries on the decision analysis and the risk assessment, enable the productive forces to obtain the most reasonable organization, and the best economic efficiency. Keywords: ERP System, Data Mining, Decision Support System