This study describes the existence of subak as a traditional agricultural irrigation system in Bali in maintaining its existence in the midst of the rapidly changing issue of globalism. The challenge for Subak in the future is to be able to adapt to changes that occur without leaving the entity as a traditional organization that must maintain the noble values that are inherited. In this paper, we will discuss the challenges of subak both from the external side and from the internal side of the subak itself so that the existence of subak can survive in the future. The method used is a literature review from various sources of research articles. The results of the study show that Subak is experiencing challenges in land conversion, less water availability, environmental damage due to pollution, and the lower interest of the younger generation in farming. Meanwhile, from an institutional perspective, the existence of subak that is not yet a legal entity makes it difficult to prevent the transfer of land functions and resolve existing disputes between farmers. In addition, technological advances have not been fully adopted by subaks due to the limited ability of the subak's human resources.