User experience is an interdisciplinary field of study that draws on and contributes to many disciplines. Through a certain amount of literature knowledge associations, it is possible to both distinguish different concepts and identify conceptual epistemological shifts, which are extremely beneficial for overall understanding of user experience. Based on 432 papers in 14 international design journals from 2000 to 2022, 20 core authors in user experience were identified and 49 papers were analyzed by co-citation analysis. Five main lines of research on user experience, three leaps of research ideas and three cognitive paradigms were obtained. The main research lines of user experience can be divided into 5 categories. phenomenological research, process-based research, result-based research, intermediary-based research, and emerging technology-based research. The research idea has experienced three leaps. from user experience to human experience, and then to the design that surpasses people. Epistemology has formed three paradigms:a desirable product system driven by user needs, satisfying the happiness and well-being of most people driven by the sustainable development of people and society, and interaction in a decentralized human-machine relationship driven by new technologies.