This research uses a quantitative approach, where the symptoms will be measured using numbers. The results of this study, the multiple linear regression equation Y = 15,676 + 0.681X1 - 0.080X2. This means that the principal's leadership style variables and motivation have a significant relationship with teacher performance at SMK Negeri 2 Tebing Tinggi. The coefficient determinant of R² is 0.502 or 50.2%. This means that the Principal leadership style variable (X1) and motivation (X2) can explain the teacher performance variable (Y) by 50.2%, the remaining 49.8% (100% - 50.2%) is explained by other variables that not included in this study such as reward, punishment, communication, education level, years of service, work absenteeism rates, etc., which were not thorough in this study. After testing the hypothesis that the calculated value of 5.529 was obtained. With α = 5%, dk = 46-3 = 43 obtained a table value of 1.681. From these figures it can be seen that tcount (5.529) > ttable (1.681), as well as the significance value of 0.00 <0.05, it can be concluded if the hypothesis is accepted. After testing the hypothesis that the t-value is -0.925. With α = 5%, dk = 46-3 = 43 obtained a table value of 1.681. From these figures it can be seen that tcount (-0.925) < ttable (1.681), as well as the significance value of 0.360 > 0.05, it can be concluded if the hypothesis is rejected. The third hypothesis proposed states that there is an influence of the Principal's leadership style and motivation on teacher performance at SMK Negeri 2 Tebing Tinggi. After being tested the Fcount value was 23.703. With α = 5%, df1 = 3, df2 = 46-3 = 43 the Ftable value of 2.82 is obtained. From these figures it can be seen that Fcount (23.703) > Ftable (3.26), as well as the significance value of 0.000b < 0.05, it can be concluded that the hypothesis is accepted