Considering the characteristic of auto-body interior layout, the object-oriented case presentation models of auto-body interior layout were presented by employing the extended object model, in which the index and solution objects were appended. Constraints of auto-body interior layout were divided into three forms: domain, rule and formulation, and their definitions were described with object models. The nearest neighborhood method was adopted for case retrieval. The strategies for case adaptation, combining parameter substitution with constrain satisfaction, were presented to modify case solution. A test system was developed with UG and VC++, and the application shows the validity and feasibility of the presented method.