The issue of love and marriage of youth has aroused broad attentions from the state and the society in China. This study analyzes behind reasons of this issue from a classic sociological perspective：structure and agency. Taking use of the recent “Love and Marriage Survey of Beijing Youth” in 2016，this study found that there is a high homogeneity among Beijing youth working in the system in socioeconomic status （education attainment，occupation，and income）.Registered residence status and ownership of properties are not significant factors determining whether Beijing youth are in romantic relationships or not. However，those two factors are crucial factors for marriage status. In terms of mate preference，there are similarities and dissimilarities among three groups of youth：single，unmarried but in a romantic relationship，married. The heterogeneity in mate preference plays an important role in love and marriage status. To resolve the issue of love and marriage of youth in Beijing，we need solutions from boththe agency and structure perspectives.