Abstract: The main function area plays a strategic, basic, and binding role in the development and protection pattern of territorial space, and is an important hand to implement precise policy and fine management and control of territorial space, in the new period, the subdivision of the main functional area has been explored extensively. Taking Zhijiang City of Hubei Province as an example, this paper constructs an evaluation index system of 'townvillage' secondary subject functional areas by combining top-down and bottom-up approaches, with quantitative functional space ratios, this paper subdivides the 'town (street)-village (community)' secondary main function area, and constructs the path of function and index transmission and the purpose and project implementation, so as to provide reference for the county-level city main function area subdivision and high-level governance.