As technology continues to advance and artificial intelligence rapidly evolves, large language model (LLM) technology has demonstrated significant potential and value across various domains. This paper aims to explore the application of LLM in spacecraft development, analyze their technical characteristics, advantages, and challenges, and provide prospects for future development. The article first introduces the basic principles and current development status of LLM technology, and then focuses on analyzing its specific application cases in spacecraft development, including the application of image recognition technology in the field of spacecraft remote sensing; Application of knowledge Q&A, technologies such as natural language processing and speech recognition during the spacecraft design phase; During the preparation stage of spacecraft assembly process documents, model training and data-driven techniques are applied. Next, the article discusses the technical challenges and solutions faced by LLM in spacecraft development. Finally, the article provides an outlook on the future development prospects.