Objective: The purpose of this study is to analyze the current situation of subjective well-being of junior high school students and its influencing factors, and to provide some practical data for school workers to develop Happiness Education. Methods: Using the method of literature review and quantitative analysis, a questionnaire survey was conducted among 132 junior high school students in a middle school in a town by subjective well-being scale for adolescents. Results: (1) The subjective well-being of junior middle school students is in the middle level (4.3738±0.6567); (2) On the gender factor, boys and girls were significantly different in school satisfaction (4.4608±1.3273, 5.1094±1.0687, t=-2.903, P<0.05) and positive emotions (3.3464±1.0852, 4.1589±1.1383, t=-3.882, P<0.05); (3) In terms of grade factors, there are significant differences in environmental satisfaction only. Through pair wise comparison after the event, it is found that there was a significant difference in environmental satisfaction between Grade7 students (4.9375±1.0398) and Grade9 students (4.1500±0.5871) (p≤0.003). The difference between other grades was not significant. (4) Through the analysis of different background data, it is shown that different background factors have different effects on the subjective well-being of junior high school students. Conclusion: The subjective well-being of junior high school students is at the middle level. In terms of gender factor, boys and girls were satisfied with school (4.4608±1.3273, 5.1094±1.0687, t=-2.903, p<0.05) and positive emotion (3.3464±1.0852, 4.1589±1.1383, t=-3.882, p<0. 05) there was significant difference in the difference. Different background factors affect the degree of subjective well-being of junior high school students, family atmosphere, the object of the two factors are the most important dimensions of subjective well-being of junior high school students. The subjective well-being of junior middle school students is basically satisfactory, and different background factors have different effects on their subjective well-being. Educators need to distinguish and guide students.