The current soil fertility status and the relationship between the soil fertilities and farmland productivity at Fengqiu in the North China Plain were studied in this paper. The results showed that soil fertilities were significantly improved since 1980s. Soil organic matter, total-N and available-P contents were increased obviously, but soil available-K was reduced remarkably. The influence of soil fertilities on corn yield was larger than that of farmland management measures. And among the factors of soil fertilities, the influence of Total-N, available-P and available-N on yield were larger. The research results could provide a scientific basis for decision-making in crop production.