The internal effect of psychological capital in the improvement of teachers' performance is that positive psychological state helps to relieve stress and burnout, generate positive emotions and internal motivation, and promote higher level of individual teachers’ performance. The external effect of psychological capital in the improvement of teachers’ performance can be seen in the formation of harmonious interpersonal relationships and positive organizational atmosphere through positive emotions, which can promote the efficiency of the use of resources around individual teachers and the improvement of another teachers’ performance. Based on the above, it is suggested that in the context of revitalizing the quality of teachers in universities, the development of teachers’ psychological capital is proposed as a new path to improve teachers’ performance.