Individual housing loan business is a main business in the banks. However, as banks expand their individual housing loans business, some banks realize that the credit risk is increasing. Modern individual housing loans management lacks a mechanism to systematically identify evaluate and control the individual housing loans. How to minimize the risk, reduce the risk of bank funds is the most imperative to all commercial banks in the individual housing loans. In this paper, we combine grey system theory with data mining, and propose a new grey data mining model based on Analytic Hierarchy Process and Grey System Theories. The useful indicator for evaluation the credit risk is mined by Data Mining, and Analytic Hierarchy Process is used to get the weight of the selected indicators. At last, the credit quality of all the alternative applicants will be classified, which provides the effective foundation.