The purpose of this study was to explore the structural relationship between educational service satisfaction, self-directed learning, learning flow, and academic happiness of adult university students in China. In order to achieve this aim, the following problems were addressed: First, what is the structural relationship between educational service satisfaction, self-directed learning, learning flow, and academic happiness of adult students? Second, how do self-directed learning and learning flow mediated in the relationship between educational service satisfaction and academic happiness of adult students? The data from 800 adult college students in China were tested using the SPSS 25.0 and AMOS 24.0 statistical packages to analyze the structural relationships among variables. The specific results are as follows: First, the research results on this showed that the satisfaction of educational services recognized by adult university students in China had a significant effect on both self-directed learning, learning flow, and academic happiness. Second, it was found that self-directed learning and learning flow recognized by adult university students in China significantly mediated the relationship between educational service satisfaction and academic happiness. According to the above results, it can be seen that adult students with high satisfaction with educational services in the degree course of lifelong education institutions in Chinese universities increase their academic happiness through self-directed learning and learning flow. In this regard, Chinese university lifelong education institutions suggest that efforts and measures to encourage adult learners' self-directed learning and learning flow as well as educational services are important to improve adult learners' academic happiness.
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