The research was aimed to study 1) the Demographic factor of monks studying at the Wat Sirindhorn Thep Rattanaram, 2) the Lifestyle of monks studying at the Wat Sirindhorn Thep Rattanaram, 3) the causal relationship model between the demographic factor, lifestyle, and monk's satisfaction at the Wat Sirindhorn Thep Rattanaram. The questionnaires were constructed as a research tool for collecting data from 80 samples of monks studying at Wat Sirindhorn Thep Rattanaram. The data were analyzed by using second-order confirmatory factor analysis. The research findings indicated that the confirmatory factor model of the factors affecting the satisfaction of monks studying at the Wat Sirindhorn Thep Rattanaram had validity, and the developed causal relationship model was confirmed with the empirical data (Chi-square = 18.367, df = 27, P = 0.892, CMIN/DF = 0.68, GFI = 0.955, AGFI = 0.909, NFI = 0.972, IFI = 1.014, CFI = 0.909, RMR = 0.014 RMSEA = 0.00) and the developed causal relationship model between the demographic factor, lifestyle, and monk's satisfaction at the Wat Sirindhorn Thep Rattanaram had predicting ability at a reasonable and acceptable level at 44.4% with its acceptance more than 40%