This is an open access book. The 3rd International Conference on Digital Economy and Computer Applications (DECA 2023) will be held on September 22–24, 2023 in Shanghai, China. Digital economy is the main economic form after agricultural economy and industrial economy. It takes data resources as the key element, modern information network as the main carrier, and the integration and application of information and communication technology and all-factor digital transformation as the important driving force to promote a new economic form that is more unified in fairness and efficiency. The essence of digital economy is informationization. Informatization is a social and economic process caused by the revolution of production tools, such as computer and Internet, from industrial economy to information economy. The theme of the conference mainly focuses on digital economy and computer applications and other related research fields, aiming to provide an international cooperation and exchange platform for experts and scholars in related research fields and enterprise development personnel to share research results, discuss existing problems and challenges, and explore cutting-edge technologies. We sincerely invite experts and scholars from universities and research institutions at home and abroad, entrepreneurs and other relevant personnel to contribute and participate in the conference. The DECA 2023 is accepting papers for proceeding publication. We accept contributions from those who care about exploring and enhancing the research and innovation in Digital Economy and Computer Applications in the world. The directions of the call for papers are as follows: Internet of Things (IoT), Blockchain Technology, Service-Oriented and Cloud, Industry Track, Deliver the Intelligent Enterprise, Mobile business and Autonomous Computing and other papers in line with the direction of digital economy and computer applications. We welcome submissions from scholars, students, and practitioners across many disciplines that contribute to the study and practice of Digital Economy and Computer Applications.