This study aims to determine the effect of partially and simultaneously the effect of teacher competence on teacher performance through teacher work motivation (senior high school study in Minahasa district). This study uses a quantitative method using a sample of 114 high school teachers in Minahasa district using the formula of accidential sampling. The results of the study are: (1) there is a significant and partially positive effect on teacher competence on teacher motivation meaning that if teacher competency increases, the work motivation of high school teachers in Minahasa Regency will increase. (2) There is a significant and positive influence partially on teacher competency on teacher performance. That is, if competence increases, the performance of high school teachers in Minahasa Regency will also increase. (3) There is a significant and positive influence directly on teacher work motivation on teacher performance. That is, if the teacher's work motivation increases, it will be followed by an increase in the performance of high school teachers throughout the Minahasa Regency. (4) there is a significant and positive influence simultaneously the indirect effect of teacher competence on teacher performance through teacher work motivation. That is, if low teacher competence can be mediated by work motivation so that teacher performance can increase.