Adhering to bottom-line thinking is an important approach to addressing the risks and challenges of rural homestead system reform and resolving complex contradictions.The bottom line of rural homestead system reform includes the bottom line of collective ownership,the bottom line of safeguarding farmers'interests,the red line of arable land,and the bottom line of food security.Driven by the empowerment of returning rights and the visualization of property value,rural homestead system reform faces multiple risks of breaking the bottom line:firstly,behind the realization path of the economic value of homestead land use rights lies the crisis of realizing collective ownership;secondly,pilot schemes such as bidding for use and compensated withdrawal weaken the social welfare function of homesteads,challenging the bottom line of safeguarding farmers'interests;thirdly,excessive support for non-agricultural industrial land demand by homesteads poses a potential threat to the red line of arable land and food security.Faced with a series of risk issues,it is necessary to further strengthen the collective governance rights of homesteads to uphold the bottom line of collective ownership;coordinate the multiple functional values of homesteads to uphold the bottom line of farmers'interests;clarify the boundaries of regulatory responsibilities for rural homestead system reform to uphold the red line of arable land and food security.