It shows that in the Spring and Autumn Period and the Warring States Period, 2700 years ago, as the last bronze age in China, bronzes gradually withdrew from the historical stage due to the use of iron and the promotion of Niu Geng, but at the same time, the smelting technology of bronzes also reached the level of perfection. Later, with the use of ironware and the popularization of Niu Geng, it also marked the remarkable improvement of social productive forces. China's feudal economy has been further developed, marking the development of productive forces, and the iron plow Niu Geng has gradually appeared. Moreover, during the Warring States period, social unrest, wars between countries required a large amount of food supply, and rulers attached importance to the development of agriculture.