Abstract: The country credit organization of China as the only one group that survive and develop in the nation vast rural area is a disadvantaged group in all commercial banks, it should do use advanced technology and scientific management for survival and development. This article introduces that how to build the data warehouse and decision tree’s application in the country credit organization to reader, double samples are used for training and pruning the decision tree. When the tree are used for forecasting and classification the customers, it gets the accurate rate of 70 percent.

Key words: country credit organization CRM, data warehouse, data mining, decision tree