An interface information model for the combination and matching judgment of modules was established, which included six parameters: coding, module attached, type, geometry, critical geometric parameters and function flow direction of interface. Among these six parameters, the type of interface included dynamic interface and static interface, and the functional flow direction included function input and function output. The first two parameters were mainly used for the identification and retrieval of interface, and the other four were used to determine the relationship between modules, including connection and interchangeable. An example was used to illustrate the validity and rationality of the established model.