This study aims to describe the implementation of the supervision of the academic school principals in improving the performance of teachers to teach in SMP Negeri 1 Paloh Sambas. This research is a descriptive study with qualitative analysis, subjects were teachers and headmasters SMP Negeri 1 Paloh. The results showed as follows, (1) Planning academic supervision by the principal in the form formulate program supervision of an academic with the involvement of senior teachers and vice clod school, (2) the implementation of academic supervision, principals provide an assessment of the teachers those through pre-cycle, the implementation of the class visit and after the visit of the class, (3) evaluation of the supervision of academic always be evaluated by the principal, then the results are evaluated