The large-scale migration of urban and rural population broke the traditional marriage circle in rural areas,and farmers completed marriage in the open marriage market. The outflow of women in some areas leads to the structural imbalance in gender ratio creating local marriage competition and driving up the standard of bride price. Marital pressure is the external condition of the change of the bride price,while inter-generational responsibility is the internal basis of the payment of the bride price,and the change of bride price is the result of the change of external marriage situation and family ethics. The different structure of gender ratio and inter-generational responsibility in different regions caused the differences of bride price in different rural areas which can be explained from two dimensions:gender ratio structure and inter-generational responsibility.