Abstract:In the historical background of big data informationexplosion，as the China Southern Power Grid put the strategies of “Two LeanTwo Excellence. Word-class”into effect. The conception of lean management “eliminate waste,create value,continuous improvement ,strive for excellent”emerges as the time requires.How to make full use of existing contract management between data mining and upgrading the contract management ability become a new topic for contract management work.This paperstudiesthe conception of big data , data mining and application, the impact of big data on management decisions. At the same time, This paperselects valuable application points for analysis and researchcombined with the actual situation of power grid enterprises, in matter to supply the data support of saving cost, marketing direction and risk management.