Objective:To compare the difference of the subjective well-being(SWB) between undergraduate students and middle school students,and to study the correlation between SWB and personality .Methods: 115 undergraduates and 126 middle school students were rated by the General Well-Being(GWB) and the EPQ-RC.Results:There was significant difference in SWB between undergraduate and middle school students ,and SWB correlated with EPQ-E score significantly.Conclusion:SWB of the middle school students was higher than that of the undergraduate students.and the SWB positively correlated with the extraversion dimension of personality.