Abstract: Using the statistics data of the marching distance during the Spring and Autumn period and Warring States period of China, the stalagmites, tree rings, lake deposits and solar activity data in the Eastern Zhou period in China, the possible relationship between climate change in ancient China and wars during the Spring and Autumn and Warring States period is discussed. The results show that, on the scale of tens to hundreds of years, changes in solar activity, precipitation, temperature and other natural environments may indirectly affect the historical process from the Eastern Zhou period to the unification of China by the Qin Dynasty, which is a factor worthy of attention in historical research. Different from the research inferring that the dry and cold climate led to famines and wars during the monarchy period of the past two thousand years, this paper found that the earlier period in the Eastern Zhou, the intensity of war was mostly positively correlated with temperature and precipitation. Ancient China was based on agriculture, and climate-sensitive agriculture determined the economic foundation of the vassal states, directly affected their national power, and might even affect the evolution and transformation of the political system.