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The purpose of this study was to determine the effect of interpersonal communication on teacher achievement motivation, the effect of transformational leadership on teacher achievement motivation, the influence of interpersonal communication on teachers affective commitment, the effect of transformational leadership on teachers affective commitment and the effect of achievement motivation on affective commitment of teachers at Doloksanggul Humbang District Vocational School Order. This research was conducted at Doloksanggul District Vocational School, Humbang Hasundutan District. The population of this study was 169 teachers and to determine the number of samples used Kreijcie tables, as many as 118 people with Proportional Random Sampling techniques. Data collection was carried out, using a questionnaire after the instrument trial was first carried out. The data analysis technique used consisted of descriptive analysis, test requirements analysis, path analysis with a significant level of &