With the rapid development of intelligent sensing and new generation information technology, digital twin technology is leading the transformation of obstetrics. This article provides an overview of the development history, concepts, characteristics and related technologies of digital twin. At present, there is no universal understanding of the concept of digital twin among various institutions and scholars, and extensive discussions and research are needed in the future. It summarizes the application of digital twins in aerospace in the United States, and elaborates on the current application status of digital twin technology in the design, production, and operation stages of domestic aerospace. The current main problem is that there is still no effective connection between virtual and real entities, and so the direct guidance and optimization of physical entities by virtual models have not been truly achieved. It also summarizes the technical problems that still need to be continuously solved in the application of digital twins in aerospace, including sensing and data processing, high fidelity models, software platform construction, integration with new generation technologies such as artificial intelligence, etc. The current application of digital twin technology in aerospace is still in its early stages, and in the future, it is necessary to actively expand its application scope and scenarios in order to maximize the value and role of digital twin technology.