Interpreting learning motivation directly affects the process and effect of interpreting learning. This study explores the phenomenon and attributions to interpreting learning demotivation of final year interpreting graduates through a qualitative study with case study analysis. The results of the interviews reflect a significant interpreting learning demotivation of subjects during the special period. The demotivation is affected by both subjective attribution, namely the psychological factor, and objective attributions. The objective attributions include negative washback effects brought by unsatisfactory results of tests, insufficient practice conditions, lack of interpreting study time and a good interpreting learning environment, as well as the limited utility of the degree of master of translation and interpreting and interpreter certificates.