In the era of digital transformation，blockchain and Artificial Intelligence（AI）are emerging as two pivotal technologies that are increasingly converging to enable more efficient and secure data management. Blockchain，with its decentralized and immutable nature，offers robust data security，while AI enhances intelligent decision-making through advanced analytical capabilities. This article provides a comprehensive overview of the innovative integration of blockchain and AI technologies，detailing the current research landscape from three key perspectives：the synergistic applications of blockchain and AI，blockchain’s role in empowering AI，and AI’s role in enhancing blockchain. It also explores the integrated applications of these technologies in various fields，including finance，the industrial internet，the Internet of Vehicles，and smart cities. The analysis highlights the benefits of combining blockchain and AI，such as improving data trust，enhancing privacy protection，and optimizing process efficiency. This report aims to offer valuable insights and inspiration for practitioners and researchers in related fields，fostering further development and innovation in the integrated application of blockchain and AI.