Aiming at dealing with the low standardization, long design cycle and high error rate in the design of prefabricated composite insulation exterior wall panels, this paper develops an intelligent design system for composite insulation exterior wall panels based on Revit API secondary development technology and programming C#. In the paper, the intelligent wall panel layout, intelligent coding, one key project quantity statistics, one key construction drawing generation are realized. What's more, the method proposed has been successfully applied to the student apartment project of a college in Jinan, which greatly improved the efficiency of panel distribution.