This paper examines the stability and validity of a student evaluations of teaching (SET) instrument used by the administration at a university in the PR China. The SET scores for two semesters of courses taught by 435 teachers were collected. Total 388 teachers (170 males and 218 females) were also invited to fill out the 60-item NEO Five-Factor Inventory together with a demographic information questionnaire. The SET responses were found to have very high internal consistency and confirmatory factor analysis supported a one-factor solution. The SET re-test correlations were 0.62 for both the teachers who taught the same course (n = 234) and those who taught a different course in the second semester (n = 201). Linguistics teachers received higher SET scores than either social science or humanities or science and technology teachers. Student ratings were significantly related to Neuroticism and Extraversion. Regression results showed that the Big-Five personality traits as a group explained only 2.6% of the total variance of student ratings and academic discipline explained 12.7% of the total variance of student ratings. Overall the stability and validity of SET was supported and future uses of SET scores in the PR China are discussed. (Contains 1 table.)