Taking the 165 foreign teachers of Sichuan University’s University Immersion Program（UIP）in 2016 as the research object，this paper investigates the foreign teacher’s personal teaching efficacy and general teaching efficacy from six aspects，aiming to understand the status of the self-efficacy of the foreign teachers in the international summer school，analyze the cause and explore the main factors affecting the self-efficacy of the foreign teachers. Based on the study，the following pertinent suggestions are put forward from the level of teaching management：optimizing the curriculum design，perfecting the teaching management and its implementation guarantee，formulating flexible and diversified curriculum assessment standards，strengthening the communication between teachers and students，and monitoring the quality of teaching. This paper studies the international summer school from the new perspective of teachers’ self-efficacy，which to some extent enriches the connotation of the study of teachers’ sense of self-efficacy and expands the research perspective of international summer school.