The CRM(Customer Relationshlp Management) is one of personal marketing techniques that satisfy customers effectively and establish long term relationships with customers. For successful CRM, next points follow. First, to define essence of CRM is the most important point. Second, think if CRM is really necessary to your company. Third, the most important prior condition is acquiring information about customs. Fourth, set marketing strategy and strategic aim and learn how to fix the concept of custom relationshlp from the first step in order to achieve those. Fifth, exact means for accessing to CRM. Sixth, the essence of CRM must be always on the notion. It is necessary for suppliers and users to reach an agreement with enough communication for applying proper Koreanize CRM instead of careless imported solution.