Development and Classroom Application Research of Q&A System Based on LangChain + LLMs

As China emphasizes intelligent education, the application of Artificial Intelligence (AI) in this field is becoming increasingly widespread. Q&A systems, as one of the key technologies of AI, are gradually being integrated into classroom teaching. The application plays a significant role in improving teaching quality and promoting personalized learning. However, the application process faces several problems, such as insufficient digital literacy, the inapplicability of traditional assessment methods, and the backwardness of educational concepts and methods. Moreover, in the era of information overload, the information provided by intelligent Q&A systems may be inaccurate. To address these problems, this study developed an intelligent Q&A system based on LangChain framework and LLMs. The system creates a web interface using Streamlit, integrates with LLMs, and enables generative Q&A based on the content of PDF documents. In addition, the study further explores the application of the system in classroom teaching, aiming to change teachers' mindset, promote teachers' teaching innovation, enhance students' personalized learning experience, alleviate the problem of digital literacy deficit, and promote equity and change in education. This study not only provides a new teaching aid for educators, but also provides a practical reference for the in-depth development of smart education.