This study employed quantitative research that is descriptive-analytic, quantitative in the sense that this study conducted statistical tests to measure how much the relationship or strength of the relationship between the variables studied. The results of the study are as follows: 1). Relationship between Principal Competence and Teacher Performance Improvement, where the t value of 2.224 with Sig. (p = 0.033) <0.05. 2). The relationship between school culture and teacher performance improvement, where t value is 2.642 with Sig. (p = 0.014) <0.05. 3). The Sig also shows it. F (p = 0,000) or p <0.05. Based on these results, it is concluded that there is a positive relationship between principal competence and school culture and teacher performance improvement.