The quick move to non-face-to-face education caused by the sudden attack of the COVID-19 led to many problems such as faculty's burden and stress from the planning and designing of suitable on-line classes, technology system problems for both students and faculty and students' complaints of the low quality of education. Especially Project-based learning (PBL) has more challenges because it is learners-centred and is usually done in face-to-face environment. The primary purpose of this study is to investigate the factors affecting the learner's satisfaction of non-face-to-face on-line PBL classes in terms of interaction and learner's factors during the attack of COVID-19 pandemic. The data Was collected through questionnaires, from 175 undergraduate students at S women's university who took the on-line PBL classes. SEM (Structural Equation Model) was used for empirical test using SmartPLS. The results of the empirical analysis reveal that interaction and media utilization self-efficacy are likely to predict learner's satisfaction.