Abstract: This paper discussed about the ancient medical system of the Mentawai tribal community and find that the possibility of this system made the ritual a form of performance performed by Sikerei in the Postmodern era. In connection with this, the researcher formulates the research problem, namely how the form of the ritual, the factors that cause changes, and the impact caused by these changes. This study uses a qualitative method, which aims to understand and analyze the ancient healing rituals of the Mentawai tribe in the perspective of performing arts with a multidisciplinary approach.