This book constitutes the refereed proceedings of the 4th EAI International Conference on Data Information in Online Environments, DIONE 2023, held in Nanchang, China, during November 25-27, 2023.The 21 full papers  were carefully reviewed and selected from 81 submissions.The papers are grouped in thematic sessions as follows: the application of artificial intelligence: the new era of computer network by using machine learning, a caching strategy using deep q-learning for multi-access edge computing users, a deep reinforcement learning-based content updating algorithm for high definition map edge caching, advanced technology in computing, emerging technologies and applications in networks and management.