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By analyzing the conventional bus data message and dynamic scalable data message in integrated electronic projects in the fields of aviation, communication and aerospace, the structure characteristics of data message are summarized, the description model adapting to dynamic scalable data message is studied, and the implementer of dynamic scalable data message model based on XML language is given. Law. This method solves the problem that dynamic scalable data packets are difficult to describe uniformly, and decouples software code from interface definition. It solves the problem of modifying software code due to interface changes, and improves the universality and adaptability of software code. The bus interface test software designed by this method has been applied in many types of projects. It can be used to configure various types of conventional data messages or dynamic scalable data messages for data bus communication without modifying the software code.