In order to achieve scalable CRM system, to get the solution that CRM which migrated from one system to another system often needed to re-design the relational database, this paper put forward the introduction of relational database based on XML to achieve a scalable customer relationship management system programs. The program was proposed based on relational databases and XML, and achieved that the client’s property management model could be extended to form a scalable CRM system, the core model of information exchange, and descriptied the application of XML in details. In addition, examples of applications of the system was introduced to explain the value of this system.