Commercial bank is a commercial bank based CRM to maintain customer groups, security bank earnings, the development of the financial market makes the commercial bank customer groups continue to grow, to the bank customer information for meaningful use can further improve service quality and earnings of commercial banks. Data mining technology in the different stages of the customer life cycle can play different roles in the process of data mining, CRM to commercial banks of various types of decision-making to provide technical support, and the construction of CRM system based on data mining.