With the deepening of higher education reform in China, the disjunction between teaching and research is becoming more and more serious. How to actively construct the coordination mechanism of teaching and research has become a constant concern of education researchers and practitioners. The existing research have constructed the evaluation models of teaching and research respectively from various perspective, but lack comprehensive consideration for the joint benefit of teaching research. Therefore, this paper constructed the joint assessment model by adopting the data envelopment analysis method. The contribution rate variation of teaching and scientific research was analyzed, the joint benefits of teaching and research was calculated and the teaching slackness and research slackness were inspected. The empirical results show that associate professors and teachers with 3 to 10 years of teaching experience rank the first two by the joint benefit of teaching and research. They are the main undertaker of university teaching and scientific research activities. In addition, the professional title promotion will not cause teaching slackness, but is quite easy to induce research slackness. These empirical results could provide some practical guidance and empirical evidence for continuous study of the relationship between teaching and scientific research and the policy formulation.