With the modernization transformation，the rural old people’s twilight love is on the rise. Based on the qualitative research of small samples in northern rural areas， through the analysis of the characteristics of the rise of twilight love and its normative “written evidence”，this paper finds out the practical rules of money exchange and power， responsibility shedding thus comfirming that twilight love of the rural elderly is not a modern free love brought about by the development of individualism，nor is it a traditional marriage，but a functional companion ship for the elderly．It realizes the self-supporting function of male elderly living care，female elderly earning for the aged and spiritual consolation through two forms of companionship:complementary needs and mutual assistance. In order to analyze the logic of the rise of the rural old man’s twilight love，it is necessary to analyze it from the perspective of generational relationship change. In the process of urbanization and industrialization, the intergenerational relationship of peasant families has gradually become unbalanced and tends to intergenerational exploitation, which is manifested in the imbalance of resource exchange，loss of power transfer and ethical disorder. The imbalance of intergenerational relations leads to the weakening of the family’s function of supporting the elderly: the withdrawing of offspring and the self support of the elderly have become the internal logic of the rise of twilight love. The rise of twilight love in the countryside is a reflection of the family ethical crisis，and the sanctity of the peasant family tends to collapse and urgently needs to be reshaped．
