This study aimed to (1) determine the feasibility of PjBL-based interactive multimedia in improving learning outcomes of basic electricity and electronics. (2) Determine the effectiveness or feasibility of PjBL-based interactive multimedia in improving basic learning outcomes of electricity and electronics. This research method is R & D research with the ADDIE development model. The subjects of this study consisted of two material experts, two learning media experts, two learning design experts, and 50 grade X students of SMK Negeri 1 Bandar Masilam. The results showed that: (1) PBL-based interactive multimedia products were feasible to use in the learning process of basic electricity and electronics for vocational students from several experts and trials were carried out on students; and (2) indicated by the results of data processing on the results of the posttest obtained t count = 6.63 At a significant level (? = 0.05) with dk 48 obtained ttable = 1.648 so that tcount > ttable. The average effectiveness of learning outcomes in the use of PjBL-based interactive multimedia is 73%, while the group of students who do not use media is 36%. From this data, it proves that the use of PjBL-based interactive multimedia is more effective in increasing students' knowledge and competence in basic electricity and electronics learning than without using PjBL-based interactive multimedia.