Grassroots political entities, including townships, and autonomous organizations, such as villages, serve as the spatial units of national governance system. They play important roles in streamlining the central-local relationship and improving community-level service provision. While towns are part of the formal administrative hierarchy at the grassroots level, villages and communities can be considered quasi-administrative divisions.However, existing research often fails to recognize the quasi-administrative nature of many grassroots governance units, overlooking the formation process of grassroots quasi-administrative units and the conflicts that may arise between these quasi-administrative units and formal administrative divisions. Therefore, this study took "Ju" (dwellings), a newly established quasi-administrative division in the reform of state-owned farms in Hainan Province, as an example to analyze the logics and challenges of the establishment of grassroots quasiadministrative division. The analysis was based on the theoretical framework of quasi-administrative division in three dimensions: level, size, and boundary. The study found that "Ju" is a typical grassroots quasi-administrative division formed in the process of transforming agricultural reclamation system into business groups, converting farms into corporations, and shifting the social functions of farms to local governments in Hainan Province. Its administrative level is between the neighborhood committee and the township, and its social management and public service functions are mainly provided through the local governments' authorization and purchase of services. The quasi-administrative division nature of "Ju" leads to its complicated relationship with formal administrative divisions (especially township) in terms of level, size, and boundary. Specifically, the promotion channel is not guaranteed for the staff working in "Ju" and the actors that provide certain social management functions and public services are absent. It is difficult for the township government to uniformly manage different "Ju", and it is easy for the "Ju" to have disputes with the township that it belongs to and the farm company that it serves for over the territorial boundary of the administrative function and public services provision. This study is of great significance for deepening the understanding of the transformation of "danwei (work unit)" and state-owned enterprises represented by state-owned farms, exploring the paths for optimizing grassroots (quasi-)administrative division, and advancing the research on the issues of quasi-administrative division and application of the theoretical frameworks in political geography to interpret administrative division and other regions.