Based on temporary observations at SMA Negeri 2 Sentajo Raya, Kuantan Singingi Regency, the phenomena found include; There are some teachers who have not completed their learning tools, such as the Learning Implementation Plan (RPP) and so on. The presence of some teachers who do not carry out their duties in accordance with the provisions that have been determined, it can be seen that there are teachers who leave school during teaching hours. Lack of teacher initiative in developing models or learning methods that are more attractive to children. Lack of teacher creativity in providing varied media and learning resources, including using online learning applications. This type of research is School Action Research (PTS) located at SMA Negeri 2 Sentajo Raya, Kuantan Singingi Regency, which is aimed at teachers. The main reason is from the results of observations and information from teachers, that teacher performance during the pandemic is classified as lacking. The place of research is SMA Negeri 2 Sentajo Raya, Kuantan Singingi Regency. The time of this research was carried out in March 2021. The number of samples specified in this study was 26 teachers. From the description of data processing and discussion, it was concluded that the teacher's performance was obtained in the first cycle by 60% in the good category and in the second cycle increased to 91% in the good category. This means that supervision activities can improve teacher performance at SMA Negeri 2 Sentajo Raya, Kuantan Singingi Regency is said to be successful.