Objective: Based on the Sternberg’s Triangular Theory of Love, this study explores the characteristics of love, group differences, the changing trends of marriage, and its influence on marital satisfaction.Methods: 855 married individuals in the general population and 204 married nurses in military hospitals were surveyed using the Triangular Love Scale, demographic questionnaire, and the subscale of marital satisfaction of Olson Enrich Marital inventory. Results: (1) Married individuals in the general group scored significantly higher on commitment than on intimacy and passion (ps < 0.001). Married nurses in military hospitals scored significantly higher on intimacy and commitment than passion (ps<0.001). (2) The intimacy, passion and commitment of married female nurses in military hospitals were significantly higher than those of married women in general population (ps < 0.001). (3)Men scored significantly higher than women in commitment (p = 0.013). Married individuals with a college degree or less scored significantly higher than those with a college degree in commitment (p = 0.02); married individuals who live in provincial capitals and municipalities scored significantly higher than who live in prefecture-level cities in intimacy (p = 0.018). (4) Each component of love has a significant positive effect on marital satisfaction (ps < 0.01), and the regression coefficient of intimacy was greater than that of passion and commitment. (5)For the scores on the three components, men and women at different ages performed significantly differently (ps < 0.01);Women at different marriage ages and family stages scored significantly differently (ps < 0.001). Conclusions: Commitment is the main characteristic of love in married individuals in the general group, intimacy and commitment are the same characteristic of love in married nurses in military hospitals. The love experience of married nurses in military hospitals is higher than that of married women in general population. Intimacy has the strongest impact on marital satisfaction. The features and changing trend of love psychology verified some marriage phenomena, It provides the first empirical research evidence for the "seven-year itch" from the perspective of love.
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